Basic Algebra Conventions
In algebra, a letter such as x that takes the place of a number in one or more equations is called a variable. Practices you need to know about how algebra problems are written:

To add up many of the same variable, count the number of times that variable appears, and then attach that number (called a coefficient) to that variable:

x + x + x + x + x = 5x

To multiply many of the same variable, count how many times the variable appears, and then attach an exponent to that variable:

x · x · x · x = x^{4}

Write division problems as fractions:

x ÷ 2 is written as x/2