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(y+84)=5y
We move all terms to the left:
(y+84)-(5y)=0
We add all the numbers together, and all the variables
-5y+(y+84)=0
We get rid of parentheses
-5y+y+84=0
We add all the numbers together, and all the variables
-4y+84=0
We move all terms containing y to the left, all other terms to the right
-4y=-84
y=-84/-4
y=+21
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