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8a-9+6a=-31
We simplify the equation to the form, which is simple to understand
8a-9+6a=-31
We move all terms containing a to the left and all other terms to the right.
+8a+6a=-31+9
We simplify left and right side of the equation.
+14a=-22
We divide both sides of the equation by 14 to get a.
a=-1.5714285714286
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