12=3m+21

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Solution for 12=3m+21 equation:


Simplifying
12 = 3m + 21

Reorder the terms:
12 = 21 + 3m

Solving
12 = 21 + 3m

Solving for variable 'm'.

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

Add '-3m' to each side of the equation.
12 + -3m = 21 + 3m + -3m

Combine like terms: 3m + -3m = 0
12 + -3m = 21 + 0
12 + -3m = 21

Add '-12' to each side of the equation.
12 + -12 + -3m = 21 + -12

Combine like terms: 12 + -12 = 0
0 + -3m = 21 + -12
-3m = 21 + -12

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

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

Simplifying
m = -3

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