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<!DOCTYPE html>
<html>
<head>
<title>mfrac linethickness</title>
</head>
<body>
<mfrac linethickness="medium">
<mi>a</mi>
<mi>b</mi>
</mfrac>
<mo>=</mo>
<mfrac linethickness="1">
<mi>a</mi>
<mi>b</mi>
</mfrac>
<mo>=</mo>
<mfrac linethickness="medium">
<mi>a</mi>
<mi>b</mi>
</mfrac>
</math>
</body>
</html>