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2y+y+(y-7)=57
We move all terms to the left:
2y+y+(y-7)-(57)=0
We add all the numbers together, and all the variables
3y+(y-7)-57=0
We get rid of parentheses
3y+y-7-57=0
We add all the numbers together, and all the variables
4y-64=0
We move all terms containing y to the left, all other terms to the right
4y=64
y=64/4
y=16
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