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f in (-oo:+oo)
f/8 = 5.5 // - 5.5
f/8-5.5 = 0
1/8*f-5.5 = 0 // + 5.5
1/8*f = 5.5 // : 1/8
f = 5.5/1/8
f = 44
f = 44
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