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4a+3(a+4)=0
We simplify the equation to the form, which is simple to understand
4a+3(a+4)=0
Reorder the terms in parentheses
4a+(+3a+12)=0
Remove unnecessary parentheses
+4a+3a+12=0
We move all terms containing a to the left and all other terms to the right.
+4a+3a=0-12
We simplify left and right side of the equation.
+7a=-12
We divide both sides of the equation by 7 to get a.
a=-1.71428571429
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