how can i solve this problem

Step-by-step explanation:
first find x
2x+15=6x-1
15+1=6x-2x
16=4x
x=4
then find the value of the angle
6(4)-1=23
lmk if it is right
Answer:
Step-by-step explanation:
In rectangle, diagonals bisect each other and diagonals are equal.
So, AE = DE
∠ADE = ∠DAE {Angles opposite to equal sides are equal}
6x - 1 = 2x + 15
6x = 2x + 15 + 1
6x = 2x + 16
6x -2x = 16
4x = 16
x = 16/4
x = 4
∠ADE = 6x - 1
= 6*4 - 1
= 24 - 1
= 23