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f in (-oo:+oo)
(5*f)/8+1/8 = -3 // + 3
(5*f)/8+1/8+3 = 0
5/8*f+25/8 = 0 // - 25/8
5/8*f = -25/8 // : 5/8
f = -25/8/5/8
f = -5
f = -5
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