Answer:
34
Explanation:
ABD = 79
ABD = DBC + CBA
79 = (8x - 3) + (5x + 4)
combine like terms
79 = 13x + 1
goal is to isolate variable
subtract 1 from both sides
78 = 13x
divide both sides by 13
6 = x
plug x value into expression given for DBC
5(6) + 4
use pemdas
30 + 4
34