<<< native
[ EDelimited
    "("
    ")"
    [ Right
        (EGrouped
           [ EIdentifier "x"
           , ESymbol Pun ","
           , EFraction NormalFrac (EIdentifier "y") (EIdentifier "z")
           ])
    ]
, ESymbol Bin "+"
, EDelimited
    "("
    ")"
    [ Right
        (EGrouped
           [ EIdentifier "x"
           , ESymbol Pun ","
           , EFraction NormalFrac (EIdentifier "y") (EIdentifier "z")
           ])
    ]
, ESymbol Bin "+"
, EDelimited
    "("
    ")"
    [ Right
        (EGrouped
           [ EIdentifier "x"
           , ESymbol Pun ","
           , EFraction NormalFrac (EIdentifier "y") (EIdentifier "z")
           ])
    ]
]
>>> omml
<?xml version='1.0' ?>
<m:oMathPara>
  <m:oMathParaPr>
    <m:jc m:val="center" />
  </m:oMathParaPr>
  <m:oMath>
    <m:d>
      <m:dPr>
        <m:begChr m:val="(" />
        <m:endChr m:val=")" />
        <m:sepChr m:val="" />
        <m:grow />
      </m:dPr>
      <m:e>
        <m:r>
          <m:t>x</m:t>
        </m:r>
        <m:r>
          <m:rPr>
            <m:sty m:val="p" />
          </m:rPr>
          <m:t>,</m:t>
        </m:r>
        <m:f>
          <m:fPr>
            <m:type m:val="bar" />
          </m:fPr>
          <m:num>
            <m:r>
              <m:t>y</m:t>
            </m:r>
          </m:num>
          <m:den>
            <m:r>
              <m:t>z</m:t>
            </m:r>
          </m:den>
        </m:f>
      </m:e>
    </m:d>
    <m:r>
      <m:rPr>
        <m:sty m:val="p" />
      </m:rPr>
      <m:t>+</m:t>
    </m:r>
    <m:d>
      <m:dPr>
        <m:begChr m:val="(" />
        <m:endChr m:val=")" />
        <m:sepChr m:val="" />
        <m:grow />
      </m:dPr>
      <m:e>
        <m:r>
          <m:t>x</m:t>
        </m:r>
        <m:r>
          <m:rPr>
            <m:sty m:val="p" />
          </m:rPr>
          <m:t>,</m:t>
        </m:r>
        <m:f>
          <m:fPr>
            <m:type m:val="bar" />
          </m:fPr>
          <m:num>
            <m:r>
              <m:t>y</m:t>
            </m:r>
          </m:num>
          <m:den>
            <m:r>
              <m:t>z</m:t>
            </m:r>
          </m:den>
        </m:f>
      </m:e>
    </m:d>
    <m:r>
      <m:rPr>
        <m:sty m:val="p" />
      </m:rPr>
      <m:t>+</m:t>
    </m:r>
    <m:d>
      <m:dPr>
        <m:begChr m:val="(" />
        <m:endChr m:val=")" />
        <m:sepChr m:val="" />
        <m:grow />
      </m:dPr>
      <m:e>
        <m:r>
          <m:t>x</m:t>
        </m:r>
        <m:r>
          <m:rPr>
            <m:sty m:val="p" />
          </m:rPr>
          <m:t>,</m:t>
        </m:r>
        <m:f>
          <m:fPr>
            <m:type m:val="bar" />
          </m:fPr>
          <m:num>
            <m:r>
              <m:t>y</m:t>
            </m:r>
          </m:num>
          <m:den>
            <m:r>
              <m:t>z</m:t>
            </m:r>
          </m:den>
        </m:f>
      </m:e>
    </m:d>
  </m:oMath>
</m:oMathPara>