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4+3a+2(a+6)=0
We simplify the equation to the form, which is simple to understand
4+3a+2(a+6)=0
Reorder the terms in parentheses
4+3a+(+2a+12)=0
Remove unnecessary parentheses
+4+3a+2a+12=0
We move all terms containing a to the left and all other terms to the right.
+3a+2a=0-4-12
We simplify left and right side of the equation.
+5a=-16
We divide both sides of the equation by 5 to get a.
a=-3.2
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