-20=4m+40

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Solution for -20=4m+40 equation: 



-20=4m+40

We move all terms to the left:

-20-(4m+40)=0

We get rid of parentheses

-4m-40-20=0

We add all the numbers together, and all the variables

-4m-60=0

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

-4m=60

m=60/-4

m=-15

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