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-(4a+3)-(a-4)=16
We simplify the equation to the form, which is simple to understand
-(4a+3)-(a-4)=16
Remove unnecessary parentheses
-4a-3-(a-4)=16
Remove unnecessary parentheses
-4a-3-1a+4=16
We move all terms containing a to the left and all other terms to the right.
-4a-1a=+16+3-4
We simplify left and right side of the equation.
-5a=+15
We divide both sides of the equation by -5 to get a.
a=-3
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