$$2\sqrt{7}\times3\sqrt{2}=6\sqrt{14}=$$
$\text{true}$
$$6\sqrt{7}\sqrt{2}=6\sqrt{14}$$
$$6\sqrt{14}=6\sqrt{14}$$
$$6\sqrt{14}-6\sqrt{14}=0$$
$$0=0$$
$$\text{true}$$
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