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y^{2}-y-\left(y-5\right)^{2}=2
Use the distributive property to multiply y by y-1.
y^{2}-y-\left(y^{2}-10y+25\right)=2
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(y-5\right)^{2}.
y^{2}-y-y^{2}+10y-25=2
To find the opposite of y^{2}-10y+25, find the opposite of each term.
-y+10y-25=2
Combine y^{2} and -y^{2} to get 0.
9y-25=2
Combine -y and 10y to get 9y.
9y=2+25
Add 25 to both sides.
9y=27
Add 2 and 25 to get 27.
y=\frac{27}{9}
Divide both sides by 9.
y=3
Divide 27 by 9 to get 3.