Solve for M
M=6-5m
Solve for m
m=\frac{6-M}{5}
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18=3M+15m
Combine M and 2M to get 3M.
3M+15m=18
Swap sides so that all variable terms are on the left hand side.
3M=18-15m
Subtract 15m from both sides.
\frac{3M}{3}=\frac{18-15m}{3}
Divide both sides by 3.
M=\frac{18-15m}{3}
Dividing by 3 undoes the multiplication by 3.
M=6-5m
Divide 18-15m by 3.
18=3M+15m
Combine M and 2M to get 3M.
3M+15m=18
Swap sides so that all variable terms are on the left hand side.
15m=18-3M
Subtract 3M from both sides.
\frac{15m}{15}=\frac{18-3M}{15}
Divide both sides by 15.
m=\frac{18-3M}{15}
Dividing by 15 undoes the multiplication by 15.
m=\frac{6-M}{5}
Divide 18-3M by 15.
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