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x in (-oo:+oo)
-13/20 = (x^15)/16 // - (x^15)/16
-((x^15)/16)-13/20 = 0
-1/16*x^15 = 13/20 // : -1/16
x^15 = -52/5
x^15 = -52/5 // ^ 1/15
x = -(52/5)^(1/15)
x = -(52/5)^(1/15)
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