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3m+7.5m=15
We move all terms to the left:
3m+7.5m-(15)=0
We add all the numbers together, and all the variables
10.5m-15=0
We move all terms containing m to the left, all other terms to the right
10.5m=15
m=15/10.5
m=1+1.8/4.2
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