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f in (-oo:+oo)
f/8 = 1/27 // - 1/27
f/8-(1/27) = 0
f/8-1/27 = 0
1/8*f-1/27 = 0 // + 1/27
1/8*f = 1/27 // : 1/8
f = 1/27/1/8
f = 8/27
f = 8/27
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