m+2m+3m=120

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Solution for m+2m+3m=120 equation: 


Simplifying
m + 2m + 3m = 120

Combine like terms: m + 2m = 3m
3m + 3m = 120

Combine like terms: 3m + 3m = 6m
6m = 120

Solving
6m = 120

Solving for variable 'm'.

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

Divide each side by '6'.
m = 20

Simplifying
m = 20

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