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F in (-oo:+oo)
F = (1/2)*e-5 // - (1/2)*e-5
F-((1/2)*e)+5 = 0
F+(-1/2)*e+5 = 0
F-1/2*e+5 = 0 // - 5-1/2*e
F = -(5-1/2*e)
F = -(5-1/2*e)
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