3m-9+2m=21

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Solution for 3m-9+2m=21 equation: 


Simplifying
3m + -9 + 2m = 21

Reorder the terms:
-9 + 3m + 2m = 21

Combine like terms: 3m + 2m = 5m
-9 + 5m = 21

Solving
-9 + 5m = 21

Solving for variable 'm'.

Move all terms containing m to the left, all other terms to the right.

Add '9' to each side of the equation.
-9 + 9 + 5m = 21 + 9

Combine like terms: -9 + 9 = 0
0 + 5m = 21 + 9
5m = 21 + 9

Combine like terms: 21 + 9 = 30
5m = 30

Divide each side by '5'.
m = 6

Simplifying
m = 6

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