Solve for m
m=\frac{s}{15}
Solve for s
s=15m
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15m=s
Swap sides so that all variable terms are on the left hand side.
\frac{15m}{15}=\frac{s}{15}
Divide both sides by 15.
m=\frac{s}{15}
Dividing by 15 undoes the multiplication by 15.
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