x - 3 x - 9 x + 4 ----- - ----- > ----- 5 8 20
-(x - 9)/8 + (x - 3)/5 > (x + 4)/20
And(-13 < x, x < oo)
(-13 < x)∧(x < oo)
(-13, oo)
x in Interval.open(-13, oo)