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(y+1)/2-(2y+1)/2=4
We move all terms to the left:
(y+1)/2-(2y+1)/2-(4)=0
We multiply all the terms by the denominator
(y+1)-(2y+1)-4*2=0
We add all the numbers together, and all the variables
(y+1)-(2y+1)-8=0
We get rid of parentheses
y-2y+1-1-8=0
We add all the numbers together, and all the variables
-1y-8=0
We move all terms containing y to the left, all other terms to the right
-y=8
y=8/-1
y=-8
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