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15a+9a+5=-7
We simplify the equation to the form, which is simple to understand
15a+9a+5=-7
We move all terms containing a to the left and all other terms to the right.
+15a+9a=-7-5
We simplify left and right side of the equation.
+24a=-12
We divide both sides of the equation by 24 to get a.
a=-0.5
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