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3y-5(y-5)=15
We move all terms to the left:
3y-5(y-5)-(15)=0
We multiply parentheses
3y-5y+25-15=0
We add all the numbers together, and all the variables
-2y+10=0
We move all terms containing y to the left, all other terms to the right
-2y=-10
y=-10/-2
y=+5
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