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5a+5+4=-21
We simplify the equation to the form, which is simple to understand
5a+5+4=-21
We move all terms containing a to the left and all other terms to the right.
+5a=-21-5-4
We simplify left and right side of the equation.
+5a=-30
We divide both sides of the equation by 5 to get a.
a=-6
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