A number that does not stand by itself it is attached to the variable?

A number that does not stand by itself and is attached to a variable is called a coefficient. In algebraic expressions, coefficients multiply the variable they are associated with, indicating how many times the variable is being counted. For example, in the expression (3x), the number 3 is the coefficient of the variable (x). Coefficients can be positive, negative, or even fractions, depending on the context of the problem.