г) 4 8/15 - 6 7/12

1. Convert mixed numbers to improper fractions: 4 8/15 = 68/15, 6 7/12 = 79/12.
2. Rewrite the expression: 68/15 - 79/12.
3. Find a common denominator (60) and subtract: (272 - 395) / 60 = -123/60 = -41/20.