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(7y-12)=51
We move all terms to the left:
(7y-12)-(51)=0
We get rid of parentheses
7y-12-51=0
We add all the numbers together, and all the variables
7y-63=0
We move all terms containing y to the left, all other terms to the right
7y=63
y=63/7
y=9
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