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f in (-oo:+oo)
5/12 = -4*f // + -4*f
5/12-(-4*f) = 0
4*f+5/12 = 0
4*f+5/12 = 0 // - 5/12
4*f = -5/12 // : 4
f = -5/12/4
f = -5/48
f = -5/48
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