12=-2(-9-3a)

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Solution for 12=-2(-9-3a) equation:


12=-2(-9-3a)

We simplify the equation to the form, which is simple to understand 
12=-2(-9-3a)

Reorder the terms in parentheses
12=+(+18+6a)

Remove unnecessary parentheses
+12=+18+6a

We move all terms containing a to the left and all other terms to the right. 
-6a=+18-12

We simplify left and right side of the equation. 
-6a=+6

We divide both sides of the equation by -06 to get a. 
a=-1

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