12m+21=9m

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Solution for 12m+21=9m equation:


Simplifying
12m + 21 = 9m

Reorder the terms:
21 + 12m = 9m

Solving
21 + 12m = 9m

Solving for variable 'm'.

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

Add '-9m' to each side of the equation.
21 + 12m + -9m = 9m + -9m

Combine like terms: 12m + -9m = 3m
21 + 3m = 9m + -9m

Combine like terms: 9m + -9m = 0
21 + 3m = 0

Add '-21' to each side of the equation.
21 + -21 + 3m = 0 + -21

Combine like terms: 21 + -21 = 0
0 + 3m = 0 + -21
3m = 0 + -21

Combine like terms: 0 + -21 = -21
3m = -21

Divide each side by '3'.
m = -7

Simplifying
m = -7

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