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x in (-oo:+oo)
x^2 = 36/169 // - 36/169
x^2-(36/169) = 0
x^2-36/169 = 0
1*x^2 = 36/169 // : 1
x^2 = 36/169
x^2 = 36/169 // ^ 1/2
abs(x) = 6/13
x = 6/13 or x = -6/13
x in { 6/13, -6/13 }
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