## Basic College Mathematics (9th Edition)

$x=25$
We are told when a number is subtracted from five times the number, the result is 100. We will use x as the variable. Therefore, the difference between 5x and x equals 100. $5x-x=100$ Combine like terms on the left side. $5x-x=(5-1)x=4x=100$ Divide both sides by 4. $x=25$