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+12=0

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

4m=-12

m=-12/4

m=-3

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