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f in (-oo:+oo)
(2*f)/4-4 = 24/12 // - 24/12
(2*f)/4-(24/12)-4 = 0
(2*f)/4-4-2 = 0
1/2*f-6 = 0 // + 6
1/2*f = 6 // : 1/2
f = 6/1/2
f = 12
f = 12
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