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(7y-14)=21
We move all terms to the left:
(7y-14)-(21)=0
We get rid of parentheses
7y-14-21=0
We add all the numbers together, and all the variables
7y-35=0
We move all terms containing y to the left, all other terms to the right
7y=35
y=35/7
y=5
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