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(2s-10)+(2s-11)+(2s-9)=180
We move all terms to the left:
(2s-10)+(2s-11)+(2s-9)-(180)=0
We get rid of parentheses
2s+2s+2s-10-11-9-180=0
We add all the numbers together, and all the variables
6s-210=0
We move all terms containing s to the left, all other terms to the right
6s=210
s=210/6
s=35
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