<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML">
<mml:mi>A</mml:mi>
<mml:mi>x</mml:mi>
<mml:mo class="MathClass-bin">+</mml:mo>
<mml:mi>B</mml:mi>
<mml:mi>y</mml:mi>
<mml:mo class="MathClass-rel">&#8712;</mml:mo>
<mml:mi mathvariant="script">M</mml:mi>
</mml:math>