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x in (-oo:+oo)
x^(8/3) = 1.67 // - 1.67
x^(8/3)-1.67 = 0
1*x^(8/3) = 1.67 // : 1
x^(8/3) = 1.67
x^(8/3) = 1.67 // ^ 3
x^8 = 1.67^3 // ^ 1/8
abs(x) = 1.67^(3/8)
x = 1.67^(3/8) or x = -1.67^(3/8)
x in { 1.67^(3/8), -1.67^(3/8) }
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