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x in (-oo:+oo)
x^2 = 36/25 // - 36/25
x^2-(36/25) = 0
x^2-36/25 = 0
1*x^2 = 36/25 // : 1
x^2 = 36/25
x^2 = 36/25 // ^ 1/2
abs(x) = 6/5
x = 6/5 or x = -6/5
x in { 6/5, -6/5 }
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