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77=-30a-25-6-24a
We simplify the equation to the form, which is simple to understand
77=-30a-25-6-24a
We move all terms containing a to the left and all other terms to the right.
+30a+24a=-25-6-77
We simplify left and right side of the equation.
+54a=-108
We divide both sides of the equation by 54 to get a.
a=-2
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