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(2s+7)+(s+8)=180
We move all terms to the left:
(2s+7)+(s+8)-(180)=0
We get rid of parentheses
2s+s+7+8-180=0
We add all the numbers together, and all the variables
3s-165=0
We move all terms containing s to the left, all other terms to the right
3s=165
s=165/3
s=55
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