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5(4y+21)=85
We move all terms to the left:
5(4y+21)-(85)=0
We multiply parentheses
20y+105-85=0
We add all the numbers together, and all the variables
20y+20=0
We move all terms containing y to the left, all other terms to the right
20y=-20
y=-20/20
y=-1
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