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Solve for x (complex solution)
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x^{2}+5x-10y+18=0
Combine 8x and -3x to get 5x.
5x-10y+18=-x^{2}
Subtract x^{2} from both sides. Anything subtracted from zero gives its negation.
-10y+18=-x^{2}-5x
Subtract 5x from both sides.
-10y=-x^{2}-5x-18
Subtract 18 from both sides.
\frac{-10y}{-10}=\frac{-x^{2}-5x-18}{-10}
Divide both sides by -10.
y=\frac{-x^{2}-5x-18}{-10}
Dividing by -10 undoes the multiplication by -10.
y=\frac{x^{2}}{10}+\frac{x}{2}+\frac{9}{5}
Divide -x^{2}-5x-18 by -10.