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y-4=2y+7
We move all terms to the left:
y-4-(2y+7)=0
We get rid of parentheses
y-2y-7-4=0
We add all the numbers together, and all the variables
-1y-11=0
We move all terms containing y to the left, all other terms to the right
-y=11
y=11/-1
y=-11
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