[tex]3 \times ( \sqrt{12} - \sqrt{2} ) - 4 \times (5 \times \sqrt{2} - 3 \times \sqrt{3} ) = [/tex]
[tex]3 \times (2 \sqrt{3} - \sqrt{2} ) - 20 \sqrt{2} + 12 \sqrt{3} [/tex]
[tex]6 \sqrt{3} - 3 \sqrt{2} - 20 \sqrt{2} + 12 \sqrt{3} [/tex]
[tex]18 \sqrt{3} - 3 \sqrt{2} - 20 \sqrt{2} [/tex]
[tex]18 \sqrt{3 } - 23 \sqrt{2} [/tex]