12-(-8m)=28

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Solution for 12-(-8m)=28 equation: 


Simplifying
12 + -1(-8m) = 28

Remove parenthesis around (-8m)
12 + -1 * -8m = 28

Multiply -1 * -8
12 + 8m = 28

Solving
12 + 8m = 28

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 + 8m = 28 + -12

Combine like terms: 12 + -12 = 0
0 + 8m = 28 + -12
8m = 28 + -12

Combine like terms: 28 + -12 = 16
8m = 16

Divide each side by '8'.
m = 2

Simplifying
m = 2

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