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f in (-oo:+oo)
f/7 = 12/24 // - 12/24
f/7-(12/24) = 0
f/7-1/2 = 0
1/7*f-1/2 = 0 // + 1/2
1/7*f = 1/2 // : 1/7
f = 1/2/1/7
f = 7/2
f = 7/2
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