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x in (-oo:+oo)
X+(x*x)/7 = -11/7 // + -11/7
X+(x*x)/7-(-11/7) = 0
X+(x*x)/7+11/7 = 0
1/7*x^2 = -(X+11/7) // : 1/7
x^2 = -7*(X+11/7)
x^2 = -7*(X+11/7) // ^ 1/2
abs(x) = (-7)^(1/2)*(X+11/7)^(1/2)
x = (-7)^(1/2)*(X+11/7)^(1/2) or x = -((-7)^(1/2)*(X+11/7)^(1/2))
x in { (-7)^(1/2)*(X+11/7)^(1/2), -((-7)^(1/2)*(X+11/7)^(1/2)) }
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