\nthroot{7}{y^{17}}

\nthroot{8}{7^{42}}

\nthroot{16}{x^{22}}

\nthroot{12}{7^{48}}

\nthroot{20}{x^{84}}

\nthroot{18}{7^{61}}

\nthroot{12}{3^{56}}

\nthroot{8}{7^{31}}

\nthroot{19}{y^{75}}

\nthroot{9}{7^{21}}

\nthroot{9}{x^{50}}

\nthroot{11}{3^{54}}

\nthroot{10}{7^{16}}

\nthroot{14}{7^{14}}

\nthroot{18}{x^{81}}

\nthroot{8}{x^{30}}

\nthroot{18}{x^{81}}

\nthroot{20}{x^{107}}

\nthroot{15}{7^{78}}

\nthroot{13}{x^{21}}

\nthroot{9}{x^{20}}

\nthroot{10}{3^{21}}

\nthroot{5}{7^{22}}

\nthroot{5}{7^{13}}