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y in (-oo:+oo)
y*((y^3)/5)-(1/10) = 0
y*((y^3)/5)-1/10 = 0
1/5*y^4 = 1/10 // : 1/5
y^4 = 1/2
y^4 = 1/2 // ^ 1/4
abs(y) = (1/2)^(1/4)
y = (1/2)^(1/4) or y = -(1/2)^(1/4)
y in { (1/2)^(1/4), -(1/2)^(1/4) }
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