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f in (-oo:+oo)
f/4 = 5/80 // - 5/80
f/4-(5/80) = 0
f/4-1/16 = 0
1/4*f-1/16 = 0 // + 1/16
1/4*f = 1/16 // : 1/4
f = 1/16/1/4
f = 1/4
f = 1/4
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