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36*x^2-(4/9) = 0
36*x^2-4/9 = 0
36*x^2 = 4/9 // : 36
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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