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(2*x^5)/3 = -64 // + 64
(2*x^5)/3+64 = 0
2/3*x^5 = -64 // : 2/3
x^5 = -96
x^5 = -96 // ^ 1/5
x = -2*3^(1/5)
x = -2*3^(1/5)
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