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f in (-oo:+oo)
f/4 = 12/9 // - 12/9
f/4-(12/9) = 0
f/4-4/3 = 0
1/4*f-4/3 = 0 // + 4/3
1/4*f = 4/3 // : 1/4
f = 4/3/1/4
f = 16/3
f = 16/3
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