12=20-2m

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Solution for 12=20-2m equation: 



12=20-2m

We move all terms to the left:

12-(20-2m)=0

We add all the numbers together, and all the variables

-(-2m+20)+12=0

We get rid of parentheses

2m-20+12=0

We add all the numbers together, and all the variables

2m-8=0

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

2m=8

m=8/2

m=4

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