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-5(-4y-8)=100
We move all terms to the left:
-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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