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s+7+3s+2s+12+2s+12+2s+12=180
We move all terms to the left:
s+7+3s+2s+12+2s+12+2s+12-(180)=0
We add all the numbers together, and all the variables
10s-137=0
We move all terms containing s to the left, all other terms to the right
10s=137
s=137/10
s=13+7/10
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