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-(1+4a)=-9-3a
We simplify the equation to the form, which is simple to understand
-(1+4a)=-9-3a
Remove unnecessary parentheses
-1-4a=-9-3a
We move all terms containing a to the left and all other terms to the right.
-4a+3a=-9+1
We simplify left and right side of the equation.
-1a=-8
We divide both sides of the equation by -1 to get a.
a=8
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