686.4=0.2x^3/2

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Solution for 686.4=0.2x^3/2 equation: 


x in (-oo:+oo)

686.4 = (0.2*x^3)/2 // - (0.2*x^3)/2

686.4-((0.2*x^3)/2) = 0

686.4-0.1*x^3 = 0

-0.1*x^3 = -686.4 // : -0.1

x^3 = 6864

x^3 = 6864 // ^ 1/3

x = 2*858^(1/3)

x = 2*858^(1/3)

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