Andrew answered the following inequality, his work is shown below:
−5x − 7 ≤ − 52
−5x ≤ −45
x ≤ 9
What mistake did he make?
A. He should have added 7 to both sides in the first step.
B. He should have flipped the symbol in the last step.
C. He should have divided both sides by -5 in the first step.
D. He should have divided negative 45 by negative 5 and gotten -9.