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4m+(m+3)=18
We move all terms to the left:
4m+(m+3)-(18)=0
We get rid of parentheses
4m+m+3-18=0
We add all the numbers together, and all the variables
5m-15=0
We move all terms containing m to the left, all other terms to the right
5m=15
m=15/5
m=3
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