Solve for m
m=2
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3+9m=21
Combine 4m and 5m to get 9m.
9m=21-3
Subtract 3 from both sides.
9m=18
Subtract 3 from 21 to get 18.
m=\frac{18}{9}
Divide both sides by 9.
m=2
Divide 18 by 9 to get 2.
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