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X in (-oo:+oo)
(X^2)/4-(1/36) = 0
(X^2)/4-1/36 = 0
1/4*X^2 = 1/36 // : 1/4
X^2 = 1/9
X^2 = 1/9 // ^ 1/2
abs(X) = 1/3
X = 1/3 or X = -1/3
X in { 1/3, -1/3 }
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