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)
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