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21+12m=15+60m
We move all terms to the left:
21+12m-(15+60m)=0
We add all the numbers together, and all the variables
12m-(60m+15)+21=0
We get rid of parentheses
12m-60m-15+21=0
We add all the numbers together, and all the variables
-48m+6=0
We move all terms containing m to the left, all other terms to the right
-48m=-6
m=-6/-48
m=1/8
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