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(5m+3)+(8m-4)=180
We move all terms to the left:
(5m+3)+(8m-4)-(180)=0
We get rid of parentheses
5m+8m+3-4-180=0
We add all the numbers together, and all the variables
13m-181=0
We move all terms containing m to the left, all other terms to the right
13m=181
m=181/13
m=13+12/13
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