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13y-8y-4=87.85
We move all terms to the left:
13y-8y-4-(87.85)=0
We add all the numbers together, and all the variables
5y-91.85=0
We move all terms containing y to the left, all other terms to the right
5y=91.85
y=91.85/5
y=18+1/2.7027027027027
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