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4*x^3-(10*x)+(20/2)*x+3 = 0
4*x^3-10*x+(20/2)*x+3 = 0
4*x^3 = -3 // : 4
x^3 = -3/4
x^3 = -3/4 // ^ 1/3
x = -(3/4)^(1/3)
x = -(3/4)^(1/3)
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