Answer:
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Use the triangle in the middle.
It has interior angles 2x - 3 and a right angle. The exterior angle is 10x - 17.
We know the exterior angle of a triangle is same as the sum of the two remote interior angles.
Set up an equation and solve for x:
- 2x - 3 + 90 = 10x - 17
- 2x + 87 = 10x - 17
- 10x - 2x = 87 + 17
- 8x = 104
- x = 104/8
- x = 13
So the value of x is 13.