Find the student's error in solving the following inequality.
2 < - 3x - 4 < 5
6 < - 3x < 5
-2 > x > - 5/3
a. The student should have added 4 to all parts (left, middle, and right) to get 6 < - 3x < 9.
b. The student divided 6/-3 incorrectly.
c. The student should not have switched the direction of the sign in the final step.
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