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-4(-1y+1)=-20
We move all terms to the left:
-4(-1y+1)-(-20)=0
We add all the numbers together, and all the variables
-4(-1y+1)+20=0
We multiply parentheses
4y-4+20=0
We add all the numbers together, and all the variables
4y+16=0
We move all terms containing y to the left, all other terms to the right
4y=-16
y=-16/4
y=-4
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