13m-(-2m)+(-9m)=-12

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Solution for 13m-(-2m)+(-9m)=-12 equation: 


Simplifying
13m + -1(-2m) + (-9m) = -12

Remove parenthesis around (-2m)
13m + -1 * -2m + (-9m) = -12

Multiply -1 * -2
13m + 2m + (-9m) = -12

Combine like terms: 13m + 2m = 15m
15m + (-9m) = -12

Combine like terms: 15m + (-9m) = 6m
6m = -12

Solving
6m = -12

Solving for variable 'm'.

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

Divide each side by '6'.
m = -2

Simplifying
m = -2

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