\nthroot{9}{7^{29}}

\nthroot{12}{7^{27}}

\nthroot{6}{7^{8}}

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

\nthroot{15}{x^{52}}

\nthroot{12}{7^{49}}

\nthroot{20}{x^{29}}

\nthroot{13}{x^{47}}

\nthroot{19}{3^{100}}

\nthroot{5}{7^{18}}

\nthroot{14}{7^{22}}

\nthroot{5}{x^{21}}

\nthroot{6}{3^{24}}

\nthroot{11}{y^{32}}

\nthroot{7}{7^{25}}

\nthroot{18}{3^{50}}

\nthroot{5}{y^{5}}

\nthroot{14}{7^{64}}

\nthroot{18}{7^{41}}

\nthroot{19}{3^{72}}

\nthroot{6}{x^{35}}

\nthroot{5}{y^{20}}

\nthroot{6}{7^{25}}

\nthroot{18}{x^{103}}