12=20-4m

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Solution for 12=20-4m equation: 



12=20-4m

We move all terms to the left:

12-(20-4m)=0

We add all the numbers together, and all the variables

-(-4m+20)+12=0

We get rid of parentheses

4m-20+12=0

We add all the numbers together, and all the variables

4m-8=0

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

4m=8

m=8/4

m=2

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