What were the two main things that were transported on the leg of the traingular trade system between Europe and Africa?

On the first leg of their three-part journey, often called the Triangular Trade, European ships brought manufactured goods, weapons, even liquor to Africa in exchange for slaves; on the second, they transported African men, women, and children to the Americas to serve as slaves; and on the third leg, they exported

Explanation:

-16a+24b-30b+20a

(-16a+20a)+(24b-30b)

THE ANSWER IS 4A-6B