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f in (-oo:+oo)
(3/4)*(4*f-12) = 9 // - 9
(3/4)*(4*f-12)-9 = 0
3/4*(4*f-12)-9 = 0
3/4*(4*f-12)-9 = 0
3*f-18 = 0
3*f-18 = 0
3*f-18 = 0 // + 18
3*f = 18 // : 3
f = 18/3
f = 6
f = 6
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