Question

B - 9 = 21 linear equations

Answer 1

add 9 from 9 this will cancel out the nine then add 9 to 21 and what ever u get is ur answer b=30

Step-by-step explanation:

b-9=21

  +9

Answer 2

Answer: b=30

Step-by-step explanation: add 9 to both sides

b−9+9=21+9

b=30