Solve for a
a=-1
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-4a=-\left(-4\right)
Variable a cannot be equal to 0 since division by zero is not defined. Multiply both sides of the equation by 2a.
-4a=4
The opposite of -4 is 4.
a=\frac{4}{-4}
Divide both sides by -4.
a=-1
Divide 4 by -4 to get -1.
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