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y in (-oo:+oo)
12*y^6-(y^2*((16*y^5)/4)) = 0
12*y^6-4*y^7 = 0
12*y^6-4*y^7 = 0
4*y^6*(3-y) = 0
3-y = 0 // - 3
-y = -3 // * -1
y = 3
4*y^6 = 0
4*y^6 = 0 // : 4
y^6 = 0
y = 0
y in { 3, 0 }
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