a relationship or rule between two or more variables, written using pronumerals

The text you provided seems to be describing an "algebraic equation". An algebraic equation is a mathematical statement that shows the equality of two expressions by connecting them with an equals sign. It involves one or more variables (represented by letters), along with numbers and operation symbols.

Here's a step-by-step breakdown:

1. Identify the variables: Variables are often represented by letters (like x, y, or z). In the equation 2x + 3 = 7, for example, "x" is the variable.

2. Understand the relationship: The relationship between the variables is defined by the operations in the equation. In the example above, the variable x is multiplied by 2, and then 3 is added.

3. Solve the equation: To solve the equation, you need to find the value(s) of the variable(s) that make the equation true. In the example above, x would equal 2, because 2(2) + 3 = 7.

4. Check your solution: Substitute the value you found back into the original equation to make sure it holds true. In the example, substituting x = 2 gives 2(2) + 3 = 7, which is a true statement, so x = 2 is the solution.