Answer:
-1
Explanation:
We use PEMDAS to know what order to do when evaluating an equation
P - Parenthesis
E - Exponent
M - Multiplication
D - Division
A - Addition
S - Subtraction
First do what is inside the parenthesis

Now do the last step and subtract the numbers

I hope this helps please let me know if you have any other questions or if this answer is right