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4(y+8)=21
We move all terms to the left:
4(y+8)-(21)=0
We multiply parentheses
4y+32-21=0
We add all the numbers together, and all the variables
4y+11=0
We move all terms containing y to the left, all other terms to the right
4y=-11
y=-11/4
y=-2+3/4
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