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-11(9+10a)=-1639
We simplify the equation to the form, which is simple to understand
-11(9+10a)=-1639
Reorder the terms in parentheses
+(-99-110a)=-1639
Remove unnecessary parentheses
-99-110a=-1639
We move all terms containing a to the left and all other terms to the right.
-110a=-1639+99
We simplify left and right side of the equation.
-110a=-1540
We divide both sides of the equation by -110 to get a.
a=14
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