Solve for M
M=25
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102=\frac{102}{25}M
Combine \frac{12}{5}M and \frac{42}{25}M to get \frac{102}{25}M.
\frac{102}{25}M=102
Swap sides so that all variable terms are on the left hand side.
M=102\times \frac{25}{102}
Multiply both sides by \frac{25}{102}, the reciprocal of \frac{102}{25}.
M=25
Cancel out 102 and 102.
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