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9(a+2)=9
We simplify the equation to the form, which is simple to understand
9(a+2)=9
Reorder the terms in parentheses
+(+9a+18)=9
Remove unnecessary parentheses
+9a+18=+9
We move all terms containing a to the left and all other terms to the right.
+9a=+9-18
We simplify left and right side of the equation.
+9a=-9
We divide both sides of the equation by 9 to get a.
a=-1
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