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87=18-5y
We move all terms to the left:
87-(18-5y)=0
We add all the numbers together, and all the variables
-(-5y+18)+87=0
We get rid of parentheses
5y-18+87=0
We add all the numbers together, and all the variables
5y+69=0
We move all terms containing y to the left, all other terms to the right
5y=-69
y=-69/5
y=-13+4/5
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