Answer:
x=4
Step-by-step explanation:
It's an algebra question, lets start.
If 9 is subtracted by some kind of number, the answer is 5.
If the answer is 5, then we can find out what the mystery number is.
So 9 minus 5 is equal to 4.
Lets check, 9 minus 4 equals 5.
So x is 4.