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y in (-oo:+oo)
8*y^7-(y^3*((16*y^5)/4)) = 0
8*y^7-4*y^8 = 0
8*y^7-4*y^8 = 0
4*y^7*(2-y) = 0
2-y = 0 // - 2
-y = -2 // * -1
y = 2
4*y^7 = 0
4*y^7 = 0 // : 4
y^7 = 0
y = 0
y in { 2, 0 }
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