1. First, we need to find a common denominator. The least common multiple of 8 and 4 is 8.
2. -7/8 is already over 8, so we don’t need to change it.
3. We need to convert 3/4 to an equivalent fraction with denominator 8: 3/4 = (32)/(42) = 6/8
4. Now we can subtract: -7/8 – 6/8
5. Combining like terms: (-7-6)/8 = -13/8

Therefore, -7/8 – 3/4 simplifies to -13/8.