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 = x4
Write division problems as fractions:
x ÷ 2 is written as x/2
