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y in (-oo:+oo)
12*y^6-(y^2*((18*y^5)/3)) = 0
12*y^6-6*y^7 = 0
12*y^6-6*y^7 = 0
6*y^6*(2-y) = 0
2-y = 0 // - 2
-y = -2 // * -1
y = 2
6*y^6 = 0
6*y^6 = 0 // : 6
y^6 = 0
y = 0
y in { 2, 0 }
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