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f in (-oo:+oo)
f/8 = 9/18 // - 9/18
f/8-(9/18) = 0
f/8-1/2 = 0
1/8*f-1/2 = 0 // + 1/2
1/8*f = 1/2 // : 1/8
f = 1/2/1/8
f = 4
f = 4
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