Answer:
The answer is 1.
Step-by-step explanation:
9 times 7 equals 63. 6 times 7 equals 42. 3 times 7 equals 21.
63 take away 42 is 21.
21 divided by 21 is 1!
I'm not sure which one it is, so I did both.
1. 9b-(6b/3b) = 9b-2
b = 7
9(7)-2 = 61
2. (9b-6b)/3b = 1
