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1.2m+7.5m+2.1=63m
We move all terms to the left:
1.2m+7.5m+2.1-(63m)=0
We add all the numbers together, and all the variables
-54.3m+2.1=0
We move all terms containing m to the left, all other terms to the right
-54.3m=-2.1
m=-2.1/-54.3
m=1/25.857142857143
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