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7-(2y-1)=7
We move all terms to the left:
7-(2y-1)-(7)=0
We add all the numbers together, and all the variables
-(2y-1)=0
We get rid of parentheses
-2y+1=0
We move all terms containing y to the left, all other terms to the right
-2y=-1
y=-1/-2
y=1/2
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