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f in (-oo:+oo)
f/72 = 855/456 // - 855/456
f/72-(855/456) = 0
f/72-15/8 = 0
1/72*f-15/8 = 0 // + 15/8
1/72*f = 15/8 // : 1/72
f = 15/8/1/72
f = 135
f = 135
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