x^2/3-9=0

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Solution for x^2/3-9=0 equation: 


x in (-oo:+oo)

(x^2)/3-9 = 0

1/3*x^2 = 9 // : 1/3

x^2 = 27

x^2 = 27 // ^ 1/2

abs(x) = 3*3^(1/2)

x = 3*3^(1/2) or x = -(3*3^(1/2))

x in { 3*3^(1/2), -(3*3^(1/2)) }

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