The formula for the midpoint of a line segment:

where x₁, y₁ - the coordinates of one endpoint; x₂, y₂ - the coordinates of the other endpoint
Hello,
Since (BD) bissects angle ABC,
18-x=26-3x
2x=8
x=4
18-x=18-4=14
m angle ABC=14°*2=28°
The "answer" is the number that 'x' must be
in order for that equation to be true.
To find it, just divide each side of the equation by 8.3 .
Then it'll say x = 5 .