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