Answer
$$\frac{x^{5}}{y^{7}z^{3}}$$
Work Step by Step
A negative exponent is equivalent to the reciprocal of the same positive exponent:
$$x^{5}y^{-7}z^{-3}=x^{5}\times \frac{1}{y^{7}}\times \frac{1}{z^{3}}=\frac{x^{5}}{y^{7}z^{3}}.$$
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