1/81=d^2

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Solution for 1/81=d^2 equation: 


d in (-oo:+oo)

1/81 = d^2 // - d^2

1/81-d^2 = 0

-1*d^2 = -1/81 // : -1

d^2 = 1/81

d^2 = 1/81 // ^ 1/2

abs(d) = 1/9

d = 1/9 or d = -1/9

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

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