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equation and inequality
It mean that in some countries are underdevloped
The answer depends on the nature of the inequality: whether it is linear, quadratic or has some other functional form.
There appears to be no inequality in the question: only some disjoint expressions. Expressions cannot be solved.
If the absolute value inequality is of the form where the absolute value of the difference between a variable (X) and some constant (a) is compared to another constant (b) eg |X - a| compared with b, then if the comparison is < or ≤, the compound inequality is a double inequality of the form c < X < d (or ≤), and if the comparison is > or ≥, the compound inequality is a disjoint inequality of the form X < c or X > d (or including the equals). In both cases, c = b - a, d = b + a (>c)