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(12a+4)(3a-3a-1)=0
We simplify the equation to the form, which is simple to understand
(12a+4)*(3a-3a-1)=0
Reorder the terms in parentheses
multiplication of parentheses
(-12a-4a)=0
Remove unnecessary parentheses
a-4-12a=0
We move all terms containing a to the left and all other terms to the right.
a-12a=0+4
We simplify left and right side of the equation.
-12a=+4
We divide both sides of the equation by -12 to get a.
a=-0.33333333333333
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