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y^{2}+17=\left(y-1\right)\left(y-2\right)-\left(-\left(1+y\right)\times 5\right)
Variable y cannot be equal to any of the values -1,1 since division by zero is not defined. Multiply both sides of the equation by \left(y-1\right)\left(y+1\right), the least common multiple of y^{2}-1,y+1,1-y.
y^{2}+17=y^{2}-3y+2-\left(-\left(1+y\right)\times 5\right)
Use the distributive property to multiply y-1 by y-2 and combine like terms.
y^{2}+17=y^{2}-3y+2-\left(-5\left(1+y\right)\right)
Multiply -1 and 5 to get -5.
y^{2}+17=y^{2}-3y+2-\left(-5-5y\right)
Use the distributive property to multiply -5 by 1+y.
y^{2}+17=y^{2}-3y+2+5+5y
To find the opposite of -5-5y, find the opposite of each term.
y^{2}+17=y^{2}-3y+7+5y
Add 2 and 5 to get 7.
y^{2}+17=y^{2}+2y+7
Combine -3y and 5y to get 2y.
y^{2}+17-y^{2}=2y+7
Subtract y^{2} from both sides.
17=2y+7
Combine y^{2} and -y^{2} to get 0.
2y+7=17
Swap sides so that all variable terms are on the left hand side.
2y=17-7
Subtract 7 from both sides.
2y=10
Subtract 7 from 17 to get 10.
y=\frac{10}{2}
Divide both sides by 2.
y=5
Divide 10 by 2 to get 5.