To solve fo x, equate all the angles to 180 degree
That is;
x + x - 5 + x - 28 = 180 (sum of angle in a triangle)
3x -33 = 180
Add 33 to both-side
3x =213
Divide both-side by 3
x = 71
The angles are;
x = 71°
x - 5 = 71 - 5 =66°
x - 28 = 71 - 28 =43°
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