-3(-m-4)=21

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Solution for -3(-m-4)=21 equation:


Simplifying
-3(-1m + -4) = 21

Reorder the terms:
-3(-4 + -1m) = 21
(-4 * -3 + -1m * -3) = 21
(12 + 3m) = 21

Solving
12 + 3m = 21

Solving for variable 'm'.

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

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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