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y in (-oo:+oo)
(3/2)*y^4-(12*y) = 0
(3/2)*y^4-12*y = 0
3/2*y^4-12*y = 0
3*y*(1/2*y^3-4) = 0
1/2*y^3 = 4 // : 1/2
y^3 = 8
y^3 = 8 // ^ 1/3
y = 2
3*y = 0
3*y = 0 // : 3
y = 0
y in { 2, 0 }
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