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