Question

what is the first step to solving 9z-21=60​

Answer 1

add 21 to both sides, so you get 9z = 81

Answer 2

Answer:

add 21 to both sides

Step-by-step explanation:

9z-21=60

9z-21+21 =60+21

9z=81

9z/9=81/9

z = 9