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x in (-oo:+oo)
R = F/2+F*((T*T)/8) // - F/2+F*((T*T)/8)
R-(F/2)-(F*((T*T)/8)) = 0
R-(F/2)+(-1/8)*F*T^2 = 0
R-1/2*F-1/8*F*T^2 = 0
x naleu017Cy do R
x in (-oo:+oo)
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