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x in (-oo:+oo)
x^2 = 1296/625 // - 1296/625
x^2-(1296/625) = 0
x^2-1296/625 = 0
1*x^2 = 1296/625 // : 1
x^2 = 1296/625
x^2 = 1296/625 // ^ 1/2
abs(x) = 36/25
x = 36/25 or x = -36/25
x in { 36/25, -36/25 }
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