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-7m-(1-3m)=15-8m
We move all terms to the left:
-7m-(1-3m)-(15-8m)=0
We add all the numbers together, and all the variables
-7m-(-3m+1)-(-8m+15)=0
We get rid of parentheses
-7m+3m+8m-1-15=0
We add all the numbers together, and all the variables
4m-16=0
We move all terms containing m to the left, all other terms to the right
4m=16
m=16/4
m=4
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