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2y+(-4+y)=8
We move all terms to the left:
2y+(-4+y)-(8)=0
We add all the numbers together, and all the variables
2y+(y-4)-8=0
We get rid of parentheses
2y+y-4-8=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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