Answer:
2b+24x
Step-by-step explanation:
Hey There!
So for this problem all we have to do is combine like terms
The like terms for this problem would be (7b and -5b) and (3x and 21x)
7b-5b=2b
3x+21x=24x
So the expression simplified would be equal too 2b+24x
Hope this helps :)
