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3-(7-4y)=y+8
We move all terms to the left:
3-(7-4y)-(y+8)=0
We add all the numbers together, and all the variables
-(-4y+7)-(y+8)+3=0
We get rid of parentheses
4y-y-7-8+3=0
We add all the numbers together, and all the variables
3y-12=0
We move all terms containing y to the left, all other terms to the right
3y=12
y=12/3
y=4
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