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5(3+m)=45
We move all terms to the left:
5(3+m)-(45)=0
We add all the numbers together, and all the variables
5(m+3)-45=0
We multiply parentheses
5m+15-45=0
We add all the numbers together, and all the variables
5m-30=0
We move all terms containing m to the left, all other terms to the right
5m=30
m=30/5
m=6
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