Answer:
A &B
Step-by-step explanation:
We need first to remove brackets in our given expression : 4m-2-8m=-4m-2
Check A
Multiply by -2 all member of brackets:

Check B
Multiply by 2 all member of brackets :

The answer to this would be 6
just listen to ur teacher and u will learn something LOL
You get a common denominator. It's 36. Then multiply accordingly to get 16/36-3/36 = 13/36. Hope this helps.