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-5(-4y+8)=-100
We move all terms to the left:
-5(-4y+8)-(-100)=0
We add all the numbers together, and all the variables
-5(-4y+8)+100=0
We multiply parentheses
20y-40+100=0
We add all the numbers together, and all the variables
20y+60=0
We move all terms containing y to the left, all other terms to the right
20y=-60
y=-60/20
y=-3
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