Answer:
x = 7
Explanation:
This is an isosceles triangle
This means two angles are identical
There are 2 angles with the size 9x-25
Now you should add all of the angles together
104 + 9x-25 +9x-25
Then simplify this
54 + 18x
You should know that angles in a triangle add up to 180
54 + 18x = 180
Subtract 54 from both sides
18x = 126
divide both sides by 18
x = 7