The expression "(m-n)" represents a mathematical operation where two variables, m and n, are involved. In this context, m typically denotes a value or quantity that is being reduced by the value of n. The result of this operation is the difference between the two numbers, which can be positive, negative, or zero, depending on their values. In practical applications, "(m-n)" can be used in various fields such as finance, science, and engineering. For example, if m represents total revenue and n represents total expenses, then "(m-n)" calculates the profit or loss. This simple subtraction helps in making informed decisions based on the outcome.