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Y in (-oo:+oo)
Y^(8/3) = 7.1 // - 7.1
Y^(8/3)-7.1 = 0
1*Y^(8/3) = 7.1 // : 1
Y^(8/3) = 7.1
Y^(8/3) = 7.1 // ^ 3
Y^8 = 7.1^3 // ^ 1/8
abs(Y) = 7.1^(3/8)
Y = 7.1^(3/8) or Y = -7.1^(3/8)
Y in { 7.1^(3/8), -7.1^(3/8) }
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