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-3a-7-9a=-24
We simplify the equation to the form, which is simple to understand
-3a-7-9a=-24
We move all terms containing a to the left and all other terms to the right.
-3a-9a=-24+7
We simplify left and right side of the equation.
-12a=-17
We divide both sides of the equation by -12 to get a.
a=1.4166666666667
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