<<< omml
<?xml version="1.0" encoding="UTF-8"?>
<m:oMathPara>
  <m:oMath>
    <m:borderBox>
      <m:borderBoxPr>
        <m:hideTop m:val="1" />
        <m:hideBot m:val="1" />
        <m:hideLeft m:val="1" />
        <m:hideRight m:val="1" />
        <m:strikeBLTR m:val="1" />
      </m:borderBoxPr>
      <m:e>
        <m:r>
          <m:t>abc</m:t>
        </m:r>
      </m:e>
    </m:borderBox>
    <m:r>
      <m:t>d+</m:t>
    </m:r>
    <m:borderBox>
      <m:borderBoxPr>
        <m:hideTop m:val="1" />
        <m:hideBot m:val="1" />
        <m:hideLeft m:val="1" />
        <m:hideRight m:val="1" />
        <m:strikeTLBR m:val="1" />
      </m:borderBoxPr>
      <m:e>
        <m:sSup>
          <m:e>
            <m:r>
              <m:t>x</m:t>
            </m:r>
          </m:e>
          <m:sup>
            <m:r>
              <m:t>2</m:t>
            </m:r>
          </m:sup>
        </m:sSup>
      </m:e>
    </m:borderBox>
    <m:r>
      <m:t>=d+</m:t>
    </m:r>
    <m:borderBox>
      <m:borderBoxPr>
        <m:hideTop m:val="1" />
        <m:hideBot m:val="1" />
        <m:hideLeft m:val="1" />
        <m:hideRight m:val="1" />
        <m:strikeBLTR m:val="1" />
        <m:strikeTLBR m:val="1" />
      </m:borderBoxPr>
      <m:e>
        <m:sSup>
          <m:e>
            <m:r>
              <m:t>x</m:t>
            </m:r>
          </m:e>
          <m:sup>
            <m:r>
              <m:t>2</m:t>
            </m:r>
          </m:sup>
        </m:sSup>
      </m:e>
    </m:borderBox>
  </m:oMath>
</m:oMathPara>

>>> native
[ ECancel
    ForwardSlash
    (EGrouped [ EIdentifier "a" , EIdentifier "b" , EIdentifier "c" ])
, EIdentifier "d"
, ESymbol Bin "+"
, ECancel BackSlash (ESuper (EIdentifier "x") (ENumber "2"))
, ESymbol Rel "="
, EIdentifier "d"
, ESymbol Bin "+"
, ECancel XSlash (ESuper (EIdentifier "x") (ENumber "2"))
]