0=-3(3a-9)

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Solution for 0=-3(3a-9) equation:


0=-3(3a-9)

We simplify the equation to the form, which is simple to understand 
0=-3(3a-9)

Reorder the terms in parentheses
0=+(-9a+27)

Remove unnecessary parentheses
0=-9a+27

We move all terms containing a to the left and all other terms to the right. 
+9a=+27-0

We simplify left and right side of the equation. 
+9a=+27

We divide both sides of the equation by 09 to get a. 
a=3

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