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f in (-oo:+oo)
f/(7/8) = (11/7)/5 // - (11/7)/5
f/(7/8)-((11/7)/5) = 0
f/(7/8)-11/35 = 0
8/7*f-11/35 = 0 // + 11/35
8/7*f = 11/35 // : 8/7
f = 11/35/8/7
f = 11/40
f = 11/40
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