$\Large\frac{-7}{8}$ + $\Large\frac{5}{6}$ < $\Large\frac{x}{24}$ < $\Large\frac{2}{3}$
<=> $\Large\frac{-21}{24}$ + $\Large\frac{20}{24}$ < $\Large\frac{x}{24}$ < $\Large\frac{16}{24}$
<=> $\Large\frac{-21+20}{24}$ < $\Large\frac{x}{24}$ < $\Large\frac{16}{24}$
<=> $\Large\frac{-1}{24}$ < $\Large\frac{x}{24}$ < $\Large\frac{16}{24}$
$<=> -1 < x < 16$
+) TH1: Với mọi x
=> x thuộc (-1;16)
.
+) TH2: nếu x nguyên
=> x thuộc { 0; 1; 2; 3; 4; 5; 6; 7; 8; 9; 10; 11; 12; 13; 14; 15; }
