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x in (-oo:+oo)
(2*x)^(5/3) = -64 // + 64
(2*x)^(5/3)+64 = 0
2^(5/3)*x^(5/3) = -64 // : 2^(5/3)
x^(5/3) = -64/(2^(5/3))
x^(5/3) = -64/(2^(5/3)) // ^ 3
x^5 = -8192 // ^ 1/5
x = -4*8^(1/5)
x = -4*8^(1/5)
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