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15m-4m-9m-2m+3m=18
We move all terms to the left:
15m-4m-9m-2m+3m-(18)=0
We add all the numbers together, and all the variables
3m-18=0
We move all terms containing m to the left, all other terms to the right
3m=18
m=18/3
m=6
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