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8-2y=20-y
We move all terms to the left:
8-2y-(20-y)=0
We add all the numbers together, and all the variables
-2y-(-1y+20)+8=0
We get rid of parentheses
-2y+1y-20+8=0
We add all the numbers together, and all the variables
-1y-12=0
We move all terms containing y to the left, all other terms to the right
-y=12
y=12/-1
y=-12
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