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2(a-3)=15
We simplify the equation to the form, which is simple to understand
2(a-3)=15
Reorder the terms in parentheses
+(+2a-6)=15
Remove unnecessary parentheses
+2a-6=+15
We move all terms containing a to the left and all other terms to the right.
+2a=+15+6
We simplify left and right side of the equation.
+2a=+21
We divide both sides of the equation by 2 to get a.
a=10.5
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