21=12-3m

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Solution for 21=12-3m equation:


Simplifying
21 = 12 + -3m

Solving
21 = 12 + -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.
21 + 3m = 12 + -3m + 3m

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

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

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

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

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

Simplifying
m = -3

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