What does 372 minus what equals 153?

153= __ - 372

if you were to subrtact 153 from 372, the sum would be 219. Which would be rewritten as 219- 372= 153. however, because 372 is greater than 219, the sum would result in a negative sum: being -153; and because this equation calls for the sum to be a positive 153, we'd instead add 153 to 375 to get a positive answer:

153+372= 525 so,

153= 525- 372