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f in (-oo:+oo)
f/8-(5/2) = 3/4 // - 3/4
f/8-(5/2)-(3/4) = 0
f/8-5/2-3/4 = 0
1/8*f-13/4 = 0 // + 13/4
1/8*f = 13/4 // : 1/8
f = 13/4/1/8
f = 26
f = 26
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