\[= 7 - 4 \cdot 3 - 6 + 6\sqrt{12} - 9 \cdot 2 =\]
\[= 1 - 12 + 6\sqrt{4 \cdot 3} - 18 =\]
\[= 6 \cdot 2\sqrt{3} - 29 = 12\sqrt{3} - 29\]