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x in (-oo:+oo)
(2*x^2)/56 = 106 // - 106
(2*x^2)/56-106 = 0
1/28*x^2 = 106 // : 1/28
x^2 = 2968
x^2 = 2968 // ^ 1/2
abs(x) = 2*742^(1/2)
x = 2*742^(1/2) or x = -(2*742^(1/2))
x in { 2*742^(1/2), -(2*742^(1/2)) }
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