Answer:
No.
10-x and x-10 are only the same when x=10.
They are not the same because subtraction is not commutative.
Explanation:
A number less than 10 is 10-x .
The difference of a number and 10 means x-10.
10-x is not the same as x-10
We can find out when they are the same by solving:
10-x=x-10
Add x on both sides:
10=2x-10
Add 10 on both sides:
20=2x
Divide both sides by 2:
10=x
So they are only the same when x=10.
It is mainly not an identity because subtraction isn't commutative.