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f in (-oo:+oo)
(3/4)*(f-1) = 8 // - 8
(3/4)*(f-1)-8 = 0
3/4*(f-1)-8 = 0
3/4*(f-1)-8 = 0
3/4*f-35/4 = 0
3/4*f-35/4 = 0
3/4*f-35/4 = 0 // + 35/4
3/4*f = 35/4 // : 3/4
f = 35/4/3/4
f = 35/3
f = 35/3
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