We know that we're starting from a certain number m and, after subtracting 23, we're left with -50.
So, you can invent any word problem involving some initial amount, a subtraction of 23, and a result of -50. For example:
"Mary spent $23, and her bank account reads $-50. How much money did Mary have in the first place?".
or
"After the temperature dropped 23 degrees, it was -50 degrees outside. What was the temperature before the drop?"