-4m+8=20

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Solution for -4m+8=20 equation: 


Simplifying
-4m + 8 = 20

Reorder the terms:
8 + -4m = 20

Solving
8 + -4m = 20

Solving for variable 'm'.

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

Add '-8' to each side of the equation.
8 + -8 + -4m = 20 + -8

Combine like terms: 8 + -8 = 0
0 + -4m = 20 + -8
-4m = 20 + -8

Combine like terms: 20 + -8 = 12
-4m = 12

Divide each side by '-4'.
m = -3

Simplifying
m = -3

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