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x in (-oo:+oo)
(-1/3)*x^7 = 5 // - 5
(-1/3)*x^7-5 = 0
-1/3*x^7 = 5 // : -1/3
x^7 = -15
x^7 = -15 // ^ 1/7
x = -15^(1/7)
x = -15^(1/7)
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