Eduardo solved the following inequality, and his work is shown below: −5(x + 4) ≥ 4x − 38
−5x − 20 ≥ 4x − 38
−9x − 20 ≥ −38
−9x ≥ −18
x ≥ 2

What mistake did Eduardo make in solving the inequality?

a. When dividing by −9, he did not change the direction of the sign.
b. He subtracted 4x from both sides when he should have added.
c. He added 20 to both sides when he should have subtracted.
d. He did not make a mistake.