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x in (-oo:+oo)
X^2-((7/2)*x) = 5/2 // - 5/2
X^2-((7/2)*x)-(5/2) = 0
X^2+(-7/2)*x-5/2 = 0
X^2-7/2*x-5/2 = 0 // - X^2-5/2
-7/2*x = -(X^2-5/2) // : -7/2
x = (-(X^2-5/2))/(-7/2)
x = -2/7*(5/2-X^2)
x = -2/7*(5/2-X^2)
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