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$x+M+x+x+x+x+x+x+x+x+x$

Source Code:

    <math> 
      <mrow> 
        <mi>x</mi> 
        <mo>+</mo> 
        <mi>M</mi> 
        <mo>+</mo> 
        <mi mathsize='2em'>x</mi> 
        <mo>+</mo> 
        <mi mathsize='2ex'>x</mi> 
        <mo>+</mo> 
        <mi mathsize='.1in'>x</mi> 
        <mo>+</mo> 
        <mi mathsize='.5cm'>x</mi> 
        <mo>+</mo> 
        <mi mathsize='8mm'>x</mi> 
        <mo>+</mo> 
        <mi mathsize='24pt'>x</mi> 
        <mo>+</mo> 
        <mi mathsize='2pc'>x</mi> 
        <mo>+</mo> 
        <mi mathsize='75%'>x</mi> 
        <mo>+</mo> 
        <mi mathsize='36'>x</mi> 
      </mrow> 
    </math>