Answer: -1 5/6
Step-by-step explanation: First you have to set the division problem up like this, 6 7/8 div by (-3 3/4). So in -6 7/8 you are going to multiply 6x8 and then add the 7. Same thing with the other fraction. 3x4+3.
Now you have your equation: 55/8 div by 15/4. We are gonna keep change flip. 55/8 x 4/15. Now multiply. -1 5/6