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Write the expression without a radical in the denominator. In other words, rationalize the denominator:

$$\frac{-\sqrt{2}}{\sqrt{2}+7}$$

$\cfrac{-2+7\sqrt{2}}{51}$

$\cfrac{-2+7\sqrt{2}}{-47}$

$\cfrac{-4-7\sqrt{2}}{-45}$

$\sqrt{2}-7$