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-6(2+a)=39+3a
We simplify the equation to the form, which is simple to understand
-6(2+a)=39+3a
Reorder the terms in parentheses
+(-12-6a)=39+3a
Remove unnecessary parentheses
-12-6a=+39+3a
We move all terms containing a to the left and all other terms to the right.
-6a-3a=+39+12
We simplify left and right side of the equation.
-9a=+51
We divide both sides of the equation by -9 to get a.
a=-5.6666666666667
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