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2y^{2}-y-1=\left(y+5\right)\left(2y-5\right)
Use the distributive property to multiply 2y+1 by y-1 and combine like terms.
2y^{2}-y-1=2y^{2}+5y-25
Use the distributive property to multiply y+5 by 2y-5 and combine like terms.
2y^{2}-y-1-2y^{2}=5y-25
Subtract 2y^{2} from both sides.
-y-1=5y-25
Combine 2y^{2} and -2y^{2} to get 0.
-y-1-5y=-25
Subtract 5y from both sides.
-6y-1=-25
Combine -y and -5y to get -6y.
-6y=-25+1
Add 1 to both sides.
-6y=-24
Add -25 and 1 to get -24.
y=\frac{-24}{-6}
Divide both sides by -6.
y=4
Divide -24 by -6 to get 4.