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(12m-4)+(11m+5)+(16m-20)=180
We move all terms to the left:
(12m-4)+(11m+5)+(16m-20)-(180)=0
We get rid of parentheses
12m+11m+16m-4+5-20-180=0
We add all the numbers together, and all the variables
39m-199=0
We move all terms containing m to the left, all other terms to the right
39m=199
m=199/39
m=5+4/39
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