1/81=j*j

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Solution for 1/81=j*j equation: 


j in (-oo:+oo)

1/81 = j*j // - j*j

1/81-(j*j) = 0

1/81-j^2 = 0

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

j^2 = 1/81

j^2 = 1/81 // ^ 1/2

abs(j) = 1/9

j = 1/9 or j = -1/9

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

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