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9*x^4+((6*x^2)/3)*x^2-(15*x^3) = 0
9*x^4+((6*x^2)/3)*x^2-15*x^3 = 0
11*x^4-15*x^3 = 0
x^3*(11*x-15) = 0
11*x-15 = 0 // + 15
11*x = 15 // : 11
x = 15/11
x^3 = 0
1*x^3 = 0 // : 1
x^3 = 0
x = 0
x in { 15/11, 0 }
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