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y in (-oo:+oo)
18*y^6-(y^2*((16*y^5)/2)) = 0
18*y^6-8*y^7 = 0
18*y^6-8*y^7 = 0
2*y^6*(9-4*y) = 0
9-4*y = 0 // - 9
-4*y = -9 // : -4
y = -9/(-4)
y = 9/4
2*y^6 = 0
2*y^6 = 0 // : 2
y^6 = 0
y = 0
y in { 9/4, 0 }
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