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x in (-oo:+oo)
12 = (x^15)/2 // - (x^15)/2
12-((x^15)/2) = 0
-1/2*x^15 = -12 // : -1/2
x^15 = 24
x^15 = 24 // ^ 1/15
x = 24^(1/15)
x = 24^(1/15)
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