(x^2/9)-1=3

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Solution for (x^2/9)-1=3 equation: 


x in (-oo:+oo)

(x^2)/9-1 = 3 // - 3

(x^2)/9-3-1 = 0

1/9*x^2 = 4 // : 1/9

x^2 = 36

x^2 = 36 // ^ 1/2

abs(x) = 6

x = 6 or x = -6

x in { 6, -6 }

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