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x in (-oo:+oo)
x^(8/3) = 0.0189 // - 0.0189
x^(8/3)-0.0189 = 0
1*x^(8/3) = 0.0189 // : 1
x^(8/3) = 0.0189
x^(8/3) = 0.0189 // ^ 3
x^8 = 0.0189^3 // ^ 1/8
abs(x) = 0.0189^(3/8)
x = 0.0189^(3/8) or x = -0.0189^(3/8)
x in { 0.0189^(3/8), -0.0189^(3/8) }
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