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7y+12=5y+40
We move all terms to the left:
7y+12-(5y+40)=0
We get rid of parentheses
7y-5y-40+12=0
We add all the numbers together, and all the variables
2y-28=0
We move all terms containing y to the left, all other terms to the right
2y=28
y=28/2
y=14
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