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x in (-oo:+oo)
(1/8)*x < (2/5)*x-1 // - (2/5)*x-1
(1/8)*x-((2/5)*x)+1 < 0
(1/8)*x+(-2/5)*x+1 < 0
1-11/40*x < 0 // - 1
-11/40*x < -1 // : -11/40
x > -1/(-11/40)
x > 40/11
x in (40/11:+oo)
(40/11:+oo)
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