12+m=4m+21

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Solution for 12+m=4m+21 equation:


Simplifying
12 + m = 4m + 21

Reorder the terms:
12 + m = 21 + 4m

Solving
12 + m = 21 + 4m

Solving for variable 'm'.

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

Add '-4m' to each side of the equation.
12 + m + -4m = 21 + 4m + -4m

Combine like terms: m + -4m = -3m
12 + -3m = 21 + 4m + -4m

Combine like terms: 4m + -4m = 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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