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9*y^7-(((12*y^3)/3)*y^3) = 0
9*y^7-4*y^6 = 0
9*y^7-4*y^6 = 0
y^6*(9*y-4) = 0
9*y-4 = 0 // + 4
9*y = 4 // : 9
y = 4/9
y^6 = 0
1*y^6 = 0 // : 1
y^6 = 0
y = 0
y in { 4/9, 0 }
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