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-15=-3-8m-4m
We move all terms to the left:
-15-(-3-8m-4m)=0
We add all the numbers together, and all the variables
-(-12m-3)-15=0
We get rid of parentheses
12m+3-15=0
We add all the numbers together, and all the variables
12m-12=0
We move all terms containing m to the left, all other terms to the right
12m=12
m=12/12
m=1
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