Which inequality represents all possible solutions of -21b< 3

The inequality that represents all possible solutions of -21b<3 is                 b > -(3/21).

Step-by-step explanation:

Given -21b < 3 ⇒ b > 3/-21 ⇒ b > -(3/21)

When you pass a negative term from one side of the inequation to the other side, the relationship between the terms (< or >, etc) have to change, it means if the sign was > you have to change it to <, and so on.