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Solve for k
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kx^{2}-12x-36=0
Anything times zero gives zero.
kx^{2}-36=12x
Add 12x to both sides. Anything plus zero gives itself.
kx^{2}=12x+36
Add 36 to both sides.
x^{2}k=12x+36
The equation is in standard form.
\frac{x^{2}k}{x^{2}}=\frac{12x+36}{x^{2}}
Divide both sides by x^{2}.
k=\frac{12x+36}{x^{2}}
Dividing by x^{2} undoes the multiplication by x^{2}.
k=\frac{12\left(x+3\right)}{x^{2}}
Divide 36+12x by x^{2}.