Answer:

Step-by-step explanation:
In order to solve this, we are trying to find the value of
. Basically,
is a placeholder for a number that is unknown. Some number minus 3 is equal to 21.
Our goal is to find
. To do this we want to isolate
on one side of the equation

Let's add 3 to both sides.

Hope this helped!
I think it’s (A) I’m not sure...sorry if it’s wrong
Answer:Second Step
Step-by-step explanation:
On the right side in step two you added -3b-15b, and ended up with -12b. This is incorrect. -3b-15b is actually -18b
Benny started with 55 five cards. In order for his dog to have eaten half his cards and end up with 30 cards, that would mean he had 60 cards. Mind you, he had bought 5 more the day before his dog ate them. I hope that makes sense
Answer:
Answer is B
Step-by-step explanation: