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f in (-oo:+oo)
f/3.25 = 8 // - 8
f/3.25-8 = 0
0.30769231*f-8 = 0 // + 8
0.30769231*f = 8 // : 0.30769231
f = 8/0.30769231
f = 25.99999981
f = 25.99999981
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