Question 893808
(40x+39)(74x-23) <= 0

This means either (40x+39)is less than 0 or (74x-23) is less than 0 but not both.

40x+39 <=0   & (74x-23) >=0
40x <= -39   &  74x >=23

x<=-39/40    & x >=23/74

this is not a feasible solution.

(74x-23) <=0   & 40x+39 >=0 
74x <= 23      & 40x    >=-39 

X<= 23/74  & X>= -39/40

Hence the interval for X is : -39/40 <= X <= 23/74