12=21-3m

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Solution for 12=21-3m equation:


Simplifying
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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