Given:
The expression is

To find:
The value of given expression.
Solution:
We have,

BODMAS : Bracket, Order, Division, Multiplication, Addition, and Subtraction.
Using BODMAS, first we need to perform division in the given expression.



Now, apply addition.


Now, apply subtraction.

Therefore, the value of given expression is 1.
Go look them up and it should tell you the definition