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x in (-oo:+oo)
x^2+9/49 = 11/49 // - 11/49
x^2+9/49-(11/49) = 0
x^2+9/49-11/49 = 0
1*x^2 = 2/49 // : 1
x^2 = 2/49
x^2 = 2/49 // ^ 1/2
abs(x) = (2/49)^(1/2)
x = (2/49)^(1/2) or x = -(2/49)^(1/2)
x in { (2/49)^(1/2), -(2/49)^(1/2) }
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