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x^{2}-5x+15=x^{2}-3x-14+5\left(x-2\right)+3\left(13-2x\right)
Use the distributive property to multiply x by x-3.
x^{2}-5x+15=x^{2}-3x-14+5x-10+3\left(13-2x\right)
Use the distributive property to multiply 5 by x-2.
x^{2}-5x+15=x^{2}+2x-14-10+3\left(13-2x\right)
Combine -3x and 5x to get 2x.
x^{2}-5x+15=x^{2}+2x-24+3\left(13-2x\right)
Subtract 10 from -14 to get -24.
x^{2}-5x+15=x^{2}+2x-24+39-6x
Use the distributive property to multiply 3 by 13-2x.
x^{2}-5x+15=x^{2}+2x+15-6x
Add -24 and 39 to get 15.
x^{2}-5x+15=x^{2}-4x+15
Combine 2x and -6x to get -4x.
x^{2}-5x+15-x^{2}=-4x+15
Subtract x^{2} from both sides.
-5x+15=-4x+15
Combine x^{2} and -x^{2} to get 0.
-5x+15+4x=15
Add 4x to both sides.
-x+15=15
Combine -5x and 4x to get -x.
-x=15-15
Subtract 15 from both sides.
-x=0
Subtract 15 from 15 to get 0.
x=0
Product of two numbers is equal to 0 if at least one of them is 0. Since -1 is not equal to 0, x must be equal to 0.