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x^{2}-5x-3x+15-2\left(x+1\right)\left(x-1\right)
Apply the distributive property by multiplying each term of x-3 by each term of x-5.
x^{2}-8x+15-2\left(x+1\right)\left(x-1\right)
Combine -5x and -3x to get -8x.
x^{2}-8x+15+\left(-2x-2\right)\left(x-1\right)
Use the distributive property to multiply -2 by x+1.
x^{2}-8x+15-2x^{2}+2x-2x+2
Apply the distributive property by multiplying each term of -2x-2 by each term of x-1.
x^{2}-8x+15-2x^{2}+2
Combine 2x and -2x to get 0.
-x^{2}-8x+15+2
Combine x^{2} and -2x^{2} to get -x^{2}.
-x^{2}-8x+17
Add 15 and 2 to get 17.
x^{2}-5x-3x+15-2\left(x+1\right)\left(x-1\right)
Apply the distributive property by multiplying each term of x-3 by each term of x-5.
x^{2}-8x+15-2\left(x+1\right)\left(x-1\right)
Combine -5x and -3x to get -8x.
x^{2}-8x+15+\left(-2x-2\right)\left(x-1\right)
Use the distributive property to multiply -2 by x+1.
x^{2}-8x+15-2x^{2}+2x-2x+2
Apply the distributive property by multiplying each term of -2x-2 by each term of x-1.
x^{2}-8x+15-2x^{2}+2
Combine 2x and -2x to get 0.
-x^{2}-8x+15+2
Combine x^{2} and -2x^{2} to get -x^{2}.
-x^{2}-8x+17
Add 15 and 2 to get 17.