22 - 1 = -3d
21= -3d
21/-3= d
-7 = d
Bring the 1 to the other side by doing the opposite sign, so subtract 1. Solve the left side.
Bring the 3 to the other side by doing the opposite sign, so divide 21 by -3.
End with D equaling -7
It is really easy it is 6
Answer:
-1
Step-by-step explanation:
