Bd bisects abc. find abc , i’m very confused

Since BD bisects ABC, that means the expressions are equal to each other. Therefore 4x=3x+6
You have to get the variable "x" to one side so you do 4x-3x=3x-3x+6
After this the expression will look like x=6
If you need to find the degree the angle is at, you substitute 6 in for "x". By doing that, you would get the expressions 4(6) and 3(6)+6
4(6)=24
3(6)+6=24
The angle measurement would be 48°