Solve for a
a=-\frac{1}{2}=-0.5
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-2a=1
Variable a cannot be equal to 0 since division by zero is not defined. Multiply both sides of the equation by a.
a=\frac{1}{-2}
Divide both sides by -2.
a=-\frac{1}{2}
Fraction \frac{1}{-2} can be rewritten as -\frac{1}{2} by extracting the negative sign.
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