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f in (-oo:+oo)
2*f-(1/2) = 4*f+3/4 // - 4*f+3/4
2*f-(4*f)-(1/2)-(3/4) = 0
2*f-4*f-1/2-3/4 = 0
-2*f-5/4 = 0 // + 5/4
-2*f = 5/4 // : -2
f = 5/4/(-2)
f = -5/8
f = -5/8
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