-3m+m=80

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Solution for -3m+m=80 equation: 


Simplifying
-3m + m = 80

Combine like terms: -3m + m = -2m
-2m = 80

Solving
-2m = 80

Solving for variable 'm'.

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

Divide each side by '-2'.
m = -40

Simplifying
m = -40

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