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7(y-4)=-8y-13
We move all terms to the left:
7(y-4)-(-8y-13)=0
We multiply parentheses
7y-(-8y-13)-28=0
We get rid of parentheses
7y+8y+13-28=0
We add all the numbers together, and all the variables
15y-15=0
We move all terms containing y to the left, all other terms to the right
15y=15
y=15/15
y=1
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