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x in (-oo:+oo)
25/144 = x^2 // - x^2
25/144-x^2 = 0
-1*x^2 = -25/144 // : -1
x^2 = 25/144
x^2 = 25/144 // ^ 1/2
abs(x) = 5/12
x = 5/12 or x = -5/12
x in { 5/12, -5/12 }
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