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f in (-oo:+oo)
f/4-8 < 4 // - 4
f/4-8-4 < 0
1/4*f-12 < 0 // + 12
1/4*f < 12 // : 1/4
f < 12/1/4
f < 48
f in (-oo:48)
(-oo:48)
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