What is the value of x?

14-x=21

14 - x = 21

First, subtract 14 from both sides. / Your problem should look like: - x = 21 - 14

Second, simplify 21 - 14 to get 7. / Your problem should look like: - x = 7

Third, multiply both sides by - 1. / Your problem should look like: x = - 7

Answer: x = - 7