Answer
$-6\sqrt {3}$
Work Step by Step
$-\sqrt {75}+\sqrt {12}-3\sqrt {3}$ Factor.
$-\sqrt {25}\sqrt {3}+\sqrt {4}\sqrt {3}-3\sqrt {3}$ Simplify.
$-5\sqrt {3}+2\sqrt {3}-3\sqrt {3}$ Combine like radicals.
$-6\sqrt {3}$
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