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Simplify the radical expression.
[tex]13\sqrt{2} -\sqrt{2} +5\sqrt{2}[/tex]
a. [tex]18\sqrt{2}[/tex]
b. [tex]17\sqrt{6}[/tex]
c. [tex]18\sqrt{6}[/tex]
d. [tex]17\sqrt{2}[/tex]