(f - 5)*(f + 6) > (f + 10)*(f - 9)
(f - 5)*(f + 6) > (f - 9)*(f + 10)
(-oo, oo)
x in Interval(-oo, oo)
And(-oo < f, f < oo)
(-oo < f)∧(f < oo)