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x in (-oo:+oo)
64 = 4*x^(6/5) // - 4*x^(6/5)
64-(4*x^(6/5)) = 0
64-4*x^(6/5) = 0
-4*x^(6/5) = -64 // : -4
x^(6/5) = 16
x^(6/5) = 16 // ^ 5
x^6 = 1048576 // ^ 1/6
abs(x) = 8*4^(1/6)
x = 8*4^(1/6) or x = -(8*4^(1/6))
x in { 8*4^(1/6), -(8*4^(1/6)) }
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