$$2 \sqrt{ k } -6 \sqrt{ 2 } =0$$
$k=18$
$$2\sqrt{k}-6\sqrt{2}-\left(-6\sqrt{2}\right)=-\left(-6\sqrt{2}\right)$$
$$2\sqrt{k}=-\left(-6\sqrt{2}\right)$$
$$2\sqrt{k}=6\sqrt{2}$$
$$\frac{2\sqrt{k}}{2}=\frac{6\sqrt{2}}{2}$$
$$\sqrt{k}=\frac{6\sqrt{2}}{2}$$
$$\sqrt{k}=3\sqrt{2}$$
$$k=18$$
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