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f in (-oo:+oo)
f/2 = 5/8 // - 5/8
f/2-(5/8) = 0
f/2-5/8 = 0
1/2*f-5/8 = 0 // + 5/8
1/2*f = 5/8 // : 1/2
f = 5/8/1/2
f = 5/4
f = 5/4
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