0=1/81-x^2

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Solution for 0=1/81-x^2 equation: 


x in (-oo:+oo)

0 = 1/81-x^2 // - 1/81-x^2

x^2-(1/81)+0 = 0

x^2-1/81 = 0

1*x^2 = 1/81 // : 1

x^2 = 1/81

x^2 = 1/81 // ^ 1/2

abs(x) = 1/9

x = 1/9 or x = -1/9

x in { 1/9, -1/9 }

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