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y+13=7y-7=2(4y+3)
We move all terms to the left:
y+13-(7y-7)=0
We get rid of parentheses
y-7y+7+13=0
We add all the numbers together, and all the variables
-6y+20=0
We move all terms containing y to the left, all other terms to the right
-6y=-20
y=-20/-6
y=3+1/3
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