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-4m+12=-8+m
We move all terms to the left:
-4m+12-(-8+m)=0
We add all the numbers together, and all the variables
-4m-(m-8)+12=0
We get rid of parentheses
-4m-m+8+12=0
We add all the numbers together, and all the variables
-5m+20=0
We move all terms containing m to the left, all other terms to the right
-5m=-20
m=-20/-5
m=+4
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