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x in (-oo:+oo)
X^2-((5/2)*x) = x/2 // - x/2
X^2-((5/2)*x)-(x/2) = 0
X^2+(-5/2)*x-(x/2) = 0
X^2-3*x = 0 // - X^2
-3*x = -X^2 // : -3
x = (-X^2)/(-3)
x = (X^2)/3
x = (X^2)/3
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