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2x^{2}-\left(kx-3x\right)+k-1=0
Use the distributive property to multiply k-3 by x.
2x^{2}-kx+3x+k-1=0
To find the opposite of kx-3x, find the opposite of each term.
-kx+3x+k-1=-2x^{2}
Subtract 2x^{2} from both sides. Anything subtracted from zero gives its negation.
-kx+k-1=-2x^{2}-3x
Subtract 3x from both sides.
-kx+k=-2x^{2}-3x+1
Add 1 to both sides.
\left(-x+1\right)k=-2x^{2}-3x+1
Combine all terms containing k.
\left(1-x\right)k=1-3x-2x^{2}
The equation is in standard form.
\frac{\left(1-x\right)k}{1-x}=\frac{1-3x-2x^{2}}{1-x}
Divide both sides by -x+1.
k=\frac{1-3x-2x^{2}}{1-x}
Dividing by -x+1 undoes the multiplication by -x+1.