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File:	Presentation/GeneralLayout/menclose/menclose-cancellation1
CVS-ID:
Author:	Eliot Kimber, reallysi.com
Description:	Example cancellation.
Sample Rendering:

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Source Code:

<math xmlns="http://www.w3.org/1998/Math/MathML" display="block">
  <semantics>
    <mfrac>
      <mrow>
        <mrow>
          <menclose notation="updiagonalstrike">
            <mo>(</mo>
            <mrow>
              <mi>a</mi>
              <mo>&#x2212;</mo>
              <mn>3</mn>
            </mrow>
            <mo>)</mo>
          </menclose>
        </mrow>
        <mo>&#x2212;</mo>
        <mn>18</mn>
        <mi>a</mi>
      </mrow>
      <mrow>
        <mrow>
          <menclose notation="updiagonalstrike">
            <mo>(</mo>
            <mrow>
              <mi>a</mi>
              <mo>&#x2212;</mo>
              <mn>3</mn>
            </mrow>
            <mo>)</mo>
          </menclose>
        </mrow>
        <mrow>
          <mo>(</mo>
          <mrow>
            <mi>a</mi>
            <mo>+</mo>
            <mn>3</mn>
          </mrow>
          <mo>)</mo>
        </mrow>
      </mrow>
    </mfrac>
  </semantics>
</math>