[tex]3 \sqrt{11} + ( - 2 \sqrt{11} + 9 \sqrt{11} ) - 10 \sqrt{11} = 3 \sqrt{11} + ( - 2 + 9) \sqrt{11} - 10 \sqrt{11} = 3 \sqrt{11} + 7 \sqrt{11} - 10 \sqrt{11} = (3 + 7 - 10) \sqrt{11} = (10 - 10) \sqrt{11} = 0 \sqrt{11} = 0[/tex]
