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20m-12m+2m-3m+2m=18
We move all terms to the left:
20m-12m+2m-3m+2m-(18)=0
We add all the numbers together, and all the variables
9m-18=0
We move all terms containing m to the left, all other terms to the right
9m=18
m=18/9
m=2
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