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y in (-oo:+oo)
12*y^3-(((36*y^2)/4)*y^2) = 0
12*y^3-9*y^4 = 0
12*y^3-9*y^4 = 0
3*y^3*(4-3*y) = 0
4-3*y = 0 // - 4
-3*y = -4 // : -3
y = -4/(-3)
y = 4/3
3*y^3 = 0
3*y^3 = 0 // : 3
y^3 = 0
y = 0
y in { 4/3, 0 }
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