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f in (-oo:+oo)
f/3 = 1/15 // - 1/15
f/3-(1/15) = 0
f/3-1/15 = 0
1/3*f-1/15 = 0 // + 1/15
1/3*f = 1/15 // : 1/3
f = 1/15/1/3
f = 1/5
f = 1/5
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