Since the additive inverse of (–35) is +35, the given expression can be written as –28 + 35.
Now, let us subtract the magnitudes of the numbers.
35 – 28 = 7
The magnitude 35 is bigger than 28. So, we will give 7 the sign of +35, i.e., the positive sign.
∴ –28 – (–35) = +7