A number reduced by a number larger would have a negative sum.
Example:
5 - 15 = -10
An easy way to solve equations like this is to subtract the smaller number from the larger number then add a negative sign to the sum.
Example:
5 - 15 would become 15 - 5
15 - 5 = 10
Just add a negative sign and that is the answer.
5 - 15 = -10
Now, to solve your equation, we would first reverse the order.
2 - 233
233 - 2 = 231
Lastly, add the negative sign.
231 would change to -231
Your answer would be -231.
I hope this helps!