23 - (-39) what's the answer and how do i dio it, as my teacher explained it in a way i didn't understand.

-23 - -39
equals -23+39 because 2 minus signs = a plus sign
-23+39=16
the answer is 16

I know it seems hard at first but try this rule for subtraction
For subtraction of integers change the subtraction sign to positive and change the second number sign to the opposite and follow rule of addition
So it becomes
-23 +(+39) now use
Rule for addition of different signs is to subtract and use sign of larger number in answer
It just takes practice don't give up!