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x in (-oo:+oo)
X^2-(7*x)+14/4 = 11/2 // - 11/2
X^2-(7*x)+14/4-(11/2) = 0
X^2-7*x+14/4-11/2 = 0
X^2-7*x-2 = 0 // - X^2-2
-7*x = -(X^2-2) // : -7
x = (-(X^2-2))/(-7)
x = (2-X^2)/(-7)
x = (2-X^2)/(-7)
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