$$-3 \sqrt{ 3 } +3 \sqrt{ 3 } +3 \sqrt{ 3 } -4 \sqrt{ 3 } -6 \sqrt{ 3 }$$
$-7\sqrt{3}\approx -12.124355653$
$$3\sqrt{3}-4\sqrt{3}-6\sqrt{3}$$
$$-\sqrt{3}-6\sqrt{3}$$
$$-7\sqrt{3}$$
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