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7(1y-5)=21
We move all terms to the left:
7(1y-5)-(21)=0
We add all the numbers together, and all the variables
7(y-5)-21=0
We multiply parentheses
7y-35-21=0
We add all the numbers together, and all the variables
7y-56=0
We move all terms containing y to the left, all other terms to the right
7y=56
y=56/7
y=8
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