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28=8y-4y
We move all terms to the left:
28-(8y-4y)=0
We add all the numbers together, and all the variables
-(+4y)+28=0
We get rid of parentheses
-4y+28=0
We move all terms containing y to the left, all other terms to the right
-4y=-28
y=-28/-4
y=+7
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