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\left(x-1\right)x+\left(x-3\right)\left(x-1\right)\left(-2\right)=\left(x-3\right)k
Multiply both sides of the equation by \left(x-3\right)\left(x-1\right), the least common multiple of x-3,x-1.
x^{2}-x+\left(x-3\right)\left(x-1\right)\left(-2\right)=\left(x-3\right)k
Use the distributive property to multiply x-1 by x.
x^{2}-x+\left(x^{2}-4x+3\right)\left(-2\right)=\left(x-3\right)k
Use the distributive property to multiply x-3 by x-1 and combine like terms.
x^{2}-x-2x^{2}+8x-6=\left(x-3\right)k
Use the distributive property to multiply x^{2}-4x+3 by -2.
-x^{2}-x+8x-6=\left(x-3\right)k
Combine x^{2} and -2x^{2} to get -x^{2}.
-x^{2}+7x-6=\left(x-3\right)k
Combine -x and 8x to get 7x.
-x^{2}+7x-6=xk-3k
Use the distributive property to multiply x-3 by k.
xk-3k=-x^{2}+7x-6
Swap sides so that all variable terms are on the left hand side.
\left(x-3\right)k=-x^{2}+7x-6
Combine all terms containing k.
\frac{\left(x-3\right)k}{x-3}=\frac{\left(1-x\right)\left(x-6\right)}{x-3}
Divide both sides by x-3.
k=\frac{\left(1-x\right)\left(x-6\right)}{x-3}
Dividing by x-3 undoes the multiplication by x-3.