Answer:
-8/7
Step-by-step explanation:
In fraction form, division means reversed multiply.
You have -3/7 divide 3/8 which also means -3/7 multiply by 8/3, which will be -24/21. The common factor of 24 and 21 is 3 so we simplify both the numerator and denomitator by 3 and the final answer will be -8/7.
