$$( 7 ^ { - 1 } \times 5 ^ { - 1 } ) ^ { - 1 }$$
$35$
$$\left(\frac{1}{7}\times 5^{-1}\right)^{-1}$$
$$\left(\frac{1}{7}\times \frac{1}{5}\right)^{-1}$$
$$\left(\frac{1}{35}\right)^{-1}$$
$$35$$
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$5\times 7$
