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7y+12y=5y+40
We move all terms to the left:
7y+12y-(5y+40)=0
We add all the numbers together, and all the variables
19y-(5y+40)=0
We get rid of parentheses
19y-5y-40=0
We add all the numbers together, and all the variables
14y-40=0
We move all terms containing y to the left, all other terms to the right
14y=40
y=40/14
y=2+6/7
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