Answer
$-7\sqrt {5x}+7\sqrt 2$
Work Step by Step
Step 1: $\sqrt {5x}+7\sqrt 2-8\sqrt {5x}$
Step 2: $\sqrt {5x}-8\sqrt {5x}+7\sqrt 2$
Step 3: $(1-8)\sqrt {5x}+7\sqrt 2$
Step 4: $-7\sqrt {5x}+7\sqrt 2$
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