2*d - 1/2 - 4*d - 4/5 > 0
-4*d + 2*d - 1/2 - 4/5 > 0
-13 (-oo, ----) 20
x in Interval.open(-oo, -13/20)
/ -13 \ And|-oo < d, d < ----| \ 20 /
(-oo < d)∧(d < -13/20)