D:21 units please help for grade ‼️

Answer:
BD = 14 Units
Step-by-step explanation:
First Solve for x
BE = DE
10x-3 = 8x-1
-8x -8x
2x-3=-1
Add 3 to each side
2x=2
Divide each side by 2
x=1
input x to each then add for total length
[10(1)-3] + [8(1)-1]
[7] + [7]
x = 14