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x in (-oo:+oo)
x^5 = 3/7 // - 3/7
x^5-(3/7) = 0
x^5-3/7 = 0
1*x^5 = 3/7 // : 1
x^5 = 3/7
x^5 = 3/7 // ^ 1/5
x = (3/7)^(1/5)
x = (3/7)^(1/5)
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