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f in (-oo:+oo)
4/5 = (1/4)*f // - (1/4)*f
4/5-((1/4)*f) = 0
(-1/4)*f+4/5 = 0
4/5-1/4*f = 0 // - 4/5
-1/4*f = -4/5 // : -1/4
f = -4/5/(-1/4)
f = 16/5
f = 16/5
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