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5(3+m)-7=0
We add all the numbers together, and all the variables
5(m+3)-7=0
We multiply parentheses
5m+15-7=0
We add all the numbers together, and all the variables
5m+8=0
We move all terms containing m to the left, all other terms to the right
5m=-8
m=-8/5
m=-1+3/5
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