Basic Concept of Inequality

In mathematics, when two expressions do not have the same value, they are not equal. This is represented using the "≠" (not equal to) symbol.
For example:
(7 + 5) ≠ (7 × 5) since 12 ≠ 35
Such representations are called inequalities.
If two expressions are not equal, one must be greater or smaller than the other. To indicate this, we use the symbols “<” (less than) and “>” (greater than).

For example:
(9 − 5) = 4, (15 ÷ 3) = 5
Since 4 is less than 5, we write:
(9 − 5) < (15 ÷ 3) or (15 ÷ 3) > (9 − 5)