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y in (-oo:+oo)
y = (y^3)/25 // - (y^3)/25
y-((y^3)/25) = 0
y-1/25*y^3 = 0
y*(1-1/25*y^2) = 0
-1/25*y^2 = -1 // : -1/25
y^2 = 25
y^2 = 25 // ^ 1/2
abs(y) = 5
y = 5 or y = -5
y = 0
y = 0
y in { 5, -5, 0 }
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