Solve for a
a=12-12\sqrt{3}\approx -8.784609691
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-12+a=6\sqrt{3}-18\sqrt{3}
Subtract 18\sqrt{3} from both sides.
-12+a=-12\sqrt{3}
Combine 6\sqrt{3} and -18\sqrt{3} to get -12\sqrt{3}.
a=-12\sqrt{3}+12
Add 12 to both sides.
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