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-8y+13(3y-15)=239
We move all terms to the left:
-8y+13(3y-15)-(239)=0
We multiply parentheses
-8y+39y-195-239=0
We add all the numbers together, and all the variables
31y-434=0
We move all terms containing y to the left, all other terms to the right
31y=434
y=434/31
y=14
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