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36*x^2-(1/81) = 0
36*x^2-1/81 = 0
36*x^2 = 1/81 // : 36
x^2 = 1/2916
x^2 = 1/2916 // ^ 1/2
abs(x) = 1/54
x = 1/54 or x = -1/54
x in { 1/54, -1/54 }
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