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84-7y=-y+-3
We move all terms to the left:
84-7y-(-y+-3)=0
We add all the numbers together, and all the variables
-7y-(-1y-3)+84=0
We get rid of parentheses
-7y+1y+3+84=0
We add all the numbers together, and all the variables
-6y+87=0
We move all terms containing y to the left, all other terms to the right
-6y=-87
y=-87/-6
y=14+1/2
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