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12+m=-5m+4m

We move all terms to the left:

12+m-(-5m+4m)=0

We add all the numbers together, and all the variables

m-(-1m)+12=0

We get rid of parentheses

m+1m+12=0

We add all the numbers together, and all the variables

2m+12=0

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

2m=-12

m=-12/2

m=-6

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