8=20-4m

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Solution for 8=20-4m equation: 



8=20-4m

We move all terms to the left:

8-(20-4m)=0

We add all the numbers together, and all the variables

-(-4m+20)+8=0

We get rid of parentheses

4m-20+8=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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