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16-12a-13=-9
We simplify the equation to the form, which is simple to understand
16-12a-13=-9
We move all terms containing a to the left and all other terms to the right.
-12a=-9-16+13
We simplify left and right side of the equation.
-12a=-12
We divide both sides of the equation by -12 to get a.
a=1
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