If 4 times of a number is subtracted from its 13 times, the result is 171. What is the number?

Question: If 4 times of a number is subtracted from its 13 times, the result is 171. What is the number?Solution:Let,The number is xATQ,13x - 4x = 171Or, 9x = 171Or, x = 171/9∴ x = 19