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Solve for x (complex solution)
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-5x+2a=-x^{2}
Subtract x^{2} from both sides. Anything subtracted from zero gives its negation.
2a=-x^{2}+5x
Add 5x to both sides.
2a=5x-x^{2}
The equation is in standard form.
\frac{2a}{2}=\frac{x\left(5-x\right)}{2}
Divide both sides by 2.
a=\frac{x\left(5-x\right)}{2}
Dividing by 2 undoes the multiplication by 2.