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-9(a+6)=-9(-3a-6)
We simplify the equation to the form, which is simple to understand
-9(a+6)=-9(-3a-6)
Reorder the terms in parentheses
+(-9a-54)=-9*(-3a-6)
Remove unnecessary parentheses
-9a-54=-9+*(-3a-6+)
Reorder the terms in parentheses
-9a-54=+(+27a+54)
Remove unnecessary parentheses
-9a-54=+27a+54
We move all terms containing a to the left and all other terms to the right.
-9a-27a=+54+54
We simplify left and right side of the equation.
-36a=+108
We divide both sides of the equation by -36 to get a.
a=-3
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