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f in (-oo:+oo)
(-3*f)/5 > -4/15 // + -4/15
(-3*f)/5-(-4/15) > 0
(-3*f)/5+4/15 > 0
4/15-3/5*f > 0 // - 4/15
-3/5*f > -4/15 // : -3/5
f < -4/15/(-3/5)
f < 4/9
f in (-oo:4/9)
(-oo:4/9)
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