X+103=180 enter the measurement of the exterior angle of the triangle.

77

Step-by-step explanation:

Remark

The two angles (x and 103 add up to 180. In other words x + 103 = 180. You treat this like an ordinary equation.

Solution

Subtract 103 from both sides.

x + 103 - 103 = 180 - 103

x = 77

You can check this. The two angles not connected to x should add up to x

42 + 35 = 77

77 has been checked to be 77

stops on an even number.