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f in (-oo:+oo)
(8*f)/9 = 117/8 // - 117/8
(8*f)/9-(117/8) = 0
(8*f)/9-117/8 = 0
8/9*f-117/8 = 0 // + 117/8
8/9*f = 117/8 // : 8/9
f = 117/8/8/9
f = 1053/64
f = 1053/64
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