[tex]\begin{aligned} \sf 9 \sqrt{2} - 7 \sqrt{2} + \sqrt{2} &= \sf 9 \sqrt{2} - 7 \sqrt{2} + 1\sqrt{2} \\ \sf &= \sf (9 - 7 + 1) \sqrt{2} \\ \sf &= \sf 3 \sqrt{2} \end{aligned}[/tex]
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[tex]\begin{aligned} \sf 9 \sqrt{2} - 7 \sqrt{2} + \sqrt{2} &= \sf 9 \sqrt{2} - 7 \sqrt{2} + 1\sqrt{2} \\ \sf &= \sf (9 - 7 + 1) \sqrt{2} \\ \sf &= \sf 3 \sqrt{2} \end{aligned}[/tex]