Answer
$ 2\sqrt {2x}$
Work Step by Step
$\sqrt {32x}+\sqrt {2x}-\sqrt {18x}=\sqrt {4^2\cdot 2x}+\sqrt {2x}-\sqrt {3^2\cdot 2x}=4\sqrt {2x}+\sqrt {2x}-3\sqrt {2x}=2\sqrt {2x}$
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