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\frac{14\sqrt{7}}{\left(\sqrt{7}\right)^{2}}-2\sqrt{7}
Rationalize the denominator of \frac{14}{\sqrt{7}} by multiplying numerator and denominator by \sqrt{7}.
\frac{14\sqrt{7}}{7}-2\sqrt{7}
The square of \sqrt{7} is 7.
2\sqrt{7}-2\sqrt{7}
Divide 14\sqrt{7} by 7 to get 2\sqrt{7}.
0
Combine 2\sqrt{7} and -2\sqrt{7} to get 0.
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