please help I have no clue how to do this

Question

b-9+6b =30

Answer 1

b-9+6b =30

5b -9 = 30

5b -9 +9 =30+9

5b = 39

5b/5 = 39/5

b = 39/5

Answer 2

b-9+6b =30

Combine like terms.

7b - 9 = 30

Add 9 to both sides.

7b = 39

Divide both sides by 7.

b = 5.5714

Answer 3

Oop

7b = 39
7b/7 = 39/7

b = 39/7