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