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87=-y/3
We move all terms to the left:
87-(-y/3)=0
We get rid of parentheses
y/3+87=0
We multiply all the terms by the denominator
y+87*3=0
We add all the numbers together, and all the variables
y+261=0
We move all terms containing y to the left, all other terms to the right
y=-261
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