Formatting of right hand side of equation should be identical to formatting of left hand side
<math xmlns="http://www.w3.org/1998/Math/MathML" display="block"> <mfrac linethickness="medium"> <mn>854513</mn> <mn>138</mn> </mfrac> <mo>=</mo> <mfrac linethickness="1"> <mn>854513</mn> <mn>138</mn> </mfrac> </math>