The expression "a + b + c" represents a simple mathematical operation where three variables, a, b, and c, are added together. Each variable can represent a number, and the result is the sum of these three values. This operation is fundamental in arithmetic and is often used in various fields, including science, engineering, and finance. In algebra, "a + b + c" can also represent a more complex equation where a, b, and c might stand for different quantities or unknowns. Understanding how to manipulate and solve such expressions is essential for solving equations and understanding relationships between variables in mathematics.