x^3+9x=1/2(18x+54)

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Solution for x^3+9x=1/2(18x+54) equation: 


x in (-oo:+oo)

x^3+9*x = (1/2)*(18*x+54) // - (1/2)*(18*x+54)

x^3-((1/2)*(18*x+54))+9*x = 0

(-1/2)*(18*x+54)+x^3+9*x = 0

x^3-1/2*(18*x+54)+9*x = 0

x^3-1/2*(18*x+54)+9*x = 0

x^3-9*x+9*x-27 = 0

x^3-27 = 0

x^3-27 = 0

1*x^3 = 27 // : 1

x^3 = 27

x^3 = 27 // ^ 1/3

x = 3

x = 3

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