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12m+12=12+18m-7m
We move all terms to the left:
12m+12-(12+18m-7m)=0
We add all the numbers together, and all the variables
12m-(11m+12)+12=0
We get rid of parentheses
12m-11m-12+12=0
We add all the numbers together, and all the variables
m=0
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