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y+4(6-y)=21
We move all terms to the left:
y+4(6-y)-(21)=0
We add all the numbers together, and all the variables
y+4(-1y+6)-21=0
We multiply parentheses
y-4y+24-21=0
We add all the numbers together, and all the variables
-3y+3=0
We move all terms containing y to the left, all other terms to the right
-3y=-3
y=-3/-3
y=1
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