- 10 - (-3)

-10 - (-3) = -10 + 3 = -7

To subtract a negative number, we can change it to addition and reverse the sign.

In this case, we have -10 - (-3).

To change the second negative to addition, we rewrite the expression as -10 + 3.

Then, we add -10 and 3:

-10 + 3 = -7.

So, -10 - (-3) = -7.