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3+7a+8a=-12
We simplify the equation to the form, which is simple to understand
3+7a+8a=-12
We move all terms containing a to the left and all other terms to the right.
+7a+8a=-12-3
We simplify left and right side of the equation.
+15a=-15
We divide both sides of the equation by 15 to get a.
a=-1
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