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X in (-oo:+oo)
(X^2)/25-6 = -2 // + 2
(X^2)/25-6+2 = 0
1/25*X^2 = 4 // : 1/25
X^2 = 100
X^2 = 100 // ^ 1/2
abs(X) = 10
X = 10 or X = -10
X in { 10, -10 }
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