Solve for M
M=3R
Solve for R
R=\frac{M}{3}
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\frac{1}{3}M=R
Swap sides so that all variable terms are on the left hand side.
\frac{\frac{1}{3}M}{\frac{1}{3}}=\frac{R}{\frac{1}{3}}
Multiply both sides by 3.
M=\frac{R}{\frac{1}{3}}
Dividing by \frac{1}{3} undoes the multiplication by \frac{1}{3}.
M=3R
Divide R by \frac{1}{3} by multiplying R by the reciprocal of \frac{1}{3}.
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