How do I solve b-9+6b=30

B-9+6b=30

b+6b=30-9

7b=21

b=21/7

b=3

Collect like terms ... 7b-9=30. Add 9 to both sides to isolate b. 7b = 39. Divide both sides by 7. B=39/7 maybe there was a problem is this equation maybe it was 7b+9=30 instead of 7b-9 = 30