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3(a-3)-2+9=15
We simplify the equation to the form, which is simple to understand
3(a-3)-2+9=15
Reorder the terms in parentheses
+(+3a-9)-2+9=15
Remove unnecessary parentheses
+3a-9-2+9=+15
We move all terms containing a to the left and all other terms to the right.
+3a=+15+9+2-9
We simplify left and right side of the equation.
+3a=+17
We divide both sides of the equation by 3 to get a.
a=5.6666666666667
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