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Solve for x (complex solution)
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2ax^{2}+1=0
Multiply both sides of the equation by x.
2ax^{2}=-1
Subtract 1 from both sides. Anything subtracted from zero gives its negation.
2x^{2}a=-1
The equation is in standard form.
\frac{2x^{2}a}{2x^{2}}=-\frac{1}{2x^{2}}
Divide both sides by 2x^{2}.
a=-\frac{1}{2x^{2}}
Dividing by 2x^{2} undoes the multiplication by 2x^{2}.