Question

PLEASE ANSWER! I NEED HELP ASAP!!

Note: Enter your answer and show all the steps that you use to solve this problem in the space provided.

d-21.4=87.9

Can someone PLEASEEEEEE tell me how to solve it!!
~Moon~
Also, this is for the Equations with Multiplication and Division Quiz Part 2 on Connexus (Connections Academy)
oobleck
just add 21.4 to both sides
Cristhian
109.3=d. Add 21.4 and 87.9=109.3