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4m-(2m+3)=8m+12m
We move all terms to the left:
4m-(2m+3)-(8m+12m)=0
We add all the numbers together, and all the variables
4m-(2m+3)-(+20m)=0
We get rid of parentheses
4m-2m-20m-3=0
We add all the numbers together, and all the variables
-18m-3=0
We move all terms containing m to the left, all other terms to the right
-18m=3
m=3/-18
m=-1/6
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