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-(4y+20)=-y+7
We move all terms to the left:
-(4y+20)-(-y+7)=0
We add all the numbers together, and all the variables
-(4y+20)-(-1y+7)=0
We get rid of parentheses
-4y+1y-20-7=0
We add all the numbers together, and all the variables
-3y-27=0
We move all terms containing y to the left, all other terms to the right
-3y=27
y=27/-3
y=-9
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