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5a+5a+15+12a+15+5a=0
We simplify the equation to the form, which is simple to understand
5a+5a+15+12a+15+5a=0
We move all terms containing a to the left and all other terms to the right.
+5a+5a+12a+5a=0-15-15
We simplify left and right side of the equation.
+27a=-30
We divide both sides of the equation by 27 to get a.
a=-1.11111111111
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