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7y=12+3y
We move all terms to the left:
7y-(12+3y)=0
We add all the numbers together, and all the variables
7y-(3y+12)=0
We get rid of parentheses
7y-3y-12=0
We add all the numbers together, and all the variables
4y-12=0
We move all terms containing y to the left, all other terms to the right
4y=12
y=12/4
y=3
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