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(m+1)+(2m-1)=180
We move all terms to the left:
(m+1)+(2m-1)-(180)=0
We get rid of parentheses
m+2m+1-1-180=0
We add all the numbers together, and all the variables
3m-180=0
We move all terms containing m to the left, all other terms to the right
3m=180
m=180/3
m=60
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