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(2y+13)-(5y-17)=240
We move all terms to the left:
(2y+13)-(5y-17)-(240)=0
We get rid of parentheses
2y-5y+13+17-240=0
We add all the numbers together, and all the variables
-3y-210=0
We move all terms containing y to the left, all other terms to the right
-3y=210
y=210/-3
y=-70
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