When dealing with addition and subtraction regarding negative numbers, it is important to remember that negative numbers will act in the opposite way as a positive number.
For example, in this problem, 15 - (-22) , It may be easier to re-write it as this:
15 + 22
The negative sign of the 22 will be negated by the subtraction sign.
15 - (-22) = 37
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-15 - (-15) = 0
3
-15-(-10)= -15+10= -5
-22
I think you mean "What does negative 10 minus 5 equal?" If not, please correct me. But, the correct answer would be -15 or negative 15.