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f in (-oo:+oo)
3/10-f = 4/5-((3/5)*f) // - 4/5-((3/5)*f)
(3/5)*f-f+3/10-(4/5) = 0
(3/5)*f-f+3/10-4/5 = 0
-2/5*f-1/2 = 0 // + 1/2
-2/5*f = 1/2 // : -2/5
f = 1/2/(-2/5)
f = -5/4
f = -5/4
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