log(2.8)*(8 - x) - 1 > 0
(8 - x)*log(2.8) - 1 > 0
(-oo, 7.02876734518299)
x in Interval.open(-oo, 7.02876734518299)
And(-oo < x, x < 7.02876734518299)
(-oo < x)∧(x < 7.02876734518299)