$$\frac{3^{-5}\times10^{-5}\times125}{5-7}\times6^{-5}}$$
$-\frac{1}{3023308800}\approx -3.307634338 \cdot 10^{-10}$
$$\frac{\frac{1}{243}\times 10^{-5}\times 125}{5-7}\times 6^{-5}$$
$$\frac{\frac{1}{243}\times \frac{1}{100000}\times 125}{5-7}\times 6^{-5}$$
$$\frac{\frac{1}{24300000}\times 125}{5-7}\times 6^{-5}$$
$$\frac{\frac{1}{194400}}{5-7}\times 6^{-5}$$
$$\frac{\frac{1}{194400}}{-2}\times 6^{-5}$$
$$\frac{1}{194400\left(-2\right)}\times 6^{-5}$$
$$\frac{1}{-388800}\times 6^{-5}$$
$$-\frac{1}{388800}\times 6^{-5}$$
$$-\frac{1}{388800}\times \frac{1}{7776}$$
$$-\frac{1}{3023308800}$$
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$-\frac{1}{3023308800} = -3.30763433758404 \times 10^{-10}$