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8(4-4y)+5y=21
We move all terms to the left:
8(4-4y)+5y-(21)=0
We add all the numbers together, and all the variables
8(-4y+4)+5y-21=0
We add all the numbers together, and all the variables
5y+8(-4y+4)-21=0
We multiply parentheses
5y-32y+32-21=0
We add all the numbers together, and all the variables
-27y+11=0
We move all terms containing y to the left, all other terms to the right
-27y=-11
y=-11/-27
y=11/27
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