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2*x^4+(8/3)*x^3 = 0
2*x^4+8/3*x^3 = 0
2*x^3*(x+4/3) = 0
x+4/3 = 0 // - 4/3
x = -4/3
2*x^3 = 0
2*x^3 = 0 // : 2
x^3 = 0
x = 0
x in { -4/3, 0 }
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