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X in (-oo:+oo)
X^2 = 36/16 // - 36/16
X^2-(36/16) = 0
X^2-9/4 = 0
1*X^2 = 9/4 // : 1
X^2 = 9/4
X^2 = 9/4 // ^ 1/2
abs(X) = 3/2
X = 3/2 or X = -3/2
X in { 3/2, -3/2 }
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