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