Kim's teacher has marked this problem as one to recheck, but Kim cannot determine what she has done incorrectly. Identify Kim's error and write a correct solution.



Six less than 2 times a number is 50. What is the number?


2x – 6 = 50 (line 1)


2x – 6 – 6 = 50 – 6 (line 2)


2x = 44 (line 3)


2x ÷ 2 = 44 ÷ 2 (line 4)


x = 22 (line 5)