N/3x3=81

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Solution for N/3x3=81 equation: 


x in (-oo:+oo)

(N/3)*x^3 = 81 // - 81

(N/3)*x^3-81 = 0

1/3*N*x^3 = 81 // : 1/3*N

x^3 = 243*N^-1

x^3 = 243*N^-1 // ^ 1/3

x = 3*9^(1/3)*N^(-1/3)

x = 3*9^(1/3)*N^(-1/3)

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