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8a-3+5-5a+a+12-9+4a=0
We simplify the equation to the form, which is simple to understand
8a-3+5-5a+a+12-9+4a=0
We move all terms containing a to the left and all other terms to the right.
+8a-5a+1a+4a=0+3-5-12+9
We simplify left and right side of the equation.
+8a=-5
We divide both sides of the equation by 8 to get a.
a=-0.625
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