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x in (-oo:+oo)
(x/12)^9 = 40000 // - 40000
(x/12)^9-40000 = 0
1/5159780352*x^9 = 40000 // : 1/5159780352
x^9 = 206391214080000
x^9 = 206391214080000 // ^ 1/9
x = 12*40000^(1/9)
x = 12*40000^(1/9)
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