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f in (-oo:+oo)
5*f-(1/2) = 4*f-(3/4) // - 4*f-(3/4)
5*f-(4*f)-(1/2)+3/4 = 0
5*f-4*f-1/2+3/4 = 0
f+1/4 = 0 // - 1/4
f = -1/4
f = -1/4
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