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Solve for y (complex solution)
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-2x+1=-y^{2}
Subtract y^{2} from both sides. Anything subtracted from zero gives its negation.
-2x=-y^{2}-1
Subtract 1 from both sides.
\frac{-2x}{-2}=\frac{-y^{2}-1}{-2}
Divide both sides by -2.
x=\frac{-y^{2}-1}{-2}
Dividing by -2 undoes the multiplication by -2.
x=\frac{y^{2}+1}{2}
Divide -y^{2}-1 by -2.