Find the student's error in solving the following inequality.
31 < - 5x + 6
25 < - 5x
-5 < x
a. The student should have added 6 to both sides instead of subtracting it.
b. The student divided 25/-5 incorrectly.
c. The student should have switched the direction of the inequality sign to get - 5> x for a final answer.
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