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-7(2-3a)+5(9-2a)=-4a-9
We simplify the equation to the form, which is simple to understand
-7(2-3a)+5(9-2a)=-4a-9
Reorder the terms in parentheses
+(-14+21a)+5*(9-2a)=-4a-9
Remove unnecessary parentheses
-14+21a+5+*(+9-2a+)=-4a-9
Reorder the terms in parentheses
-14+21a+(+45-10a)=-4a-9
Remove unnecessary parentheses
-14+21a+45-10a=-4a-9
We move all terms containing a to the left and all other terms to the right.
+21a-10a+4a=-9+14-45
We simplify left and right side of the equation.
+15a=-40
We divide both sides of the equation by 15 to get a.
a=-2.66666666667
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