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4(y-1)+5(y+1)+5(y+1)=100
We move all terms to the left:
4(y-1)+5(y+1)+5(y+1)-(100)=0
We multiply parentheses
4y+5y+5y-4+5+5-100=0
We add all the numbers together, and all the variables
14y-94=0
We move all terms containing y to the left, all other terms to the right
14y=94
y=94/14
y=6+5/7
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