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x in (-oo:+oo)
21/29 = (x^7)/29 // - (x^7)/29
21/29-((x^7)/29) = 0
-1/29*x^7 = -21/29 // : -1/29
x^7 = 21
x^7 = 21 // ^ 1/7
x = 21^(1/7)
x = 21^(1/7)
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