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m+(2m-3)=18
We move all terms to the left:
m+(2m-3)-(18)=0
We get rid of parentheses
m+2m-3-18=0
We add all the numbers together, and all the variables
3m-21=0
We move all terms containing m to the left, all other terms to the right
3m=21
m=21/3
m=7
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