80=20m+90

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Solution for 80=20m+90 equation: 



80=20m+90

We move all terms to the left:

80-(20m+90)=0

We get rid of parentheses

-20m-90+80=0

We add all the numbers together, and all the variables

-20m-10=0

We move all terms containing m to the left, all other terms to the right

-20m=10

m=10/-20

m=-1/2

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