-20=8+4m

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Solution for -20=8+4m equation: 



-20=8+4m

We move all terms to the left:

-20-(8+4m)=0

We add all the numbers together, and all the variables

-(4m+8)-20=0

We get rid of parentheses

-4m-8-20=0

We add all the numbers together, and all the variables

-4m-28=0

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

-4m=28

m=28/-4

m=-7

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