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Step-by-step explanation:
3x+40° + 4x = 11x-60°
7x + 40° = 11x - 60°
7x - 11x = -60° - 40°
-4x = -100°
x = 100/4 = 25°
Hence,
3x+40° = 3×25 + 40 = 115°
4x = 4×25 = 100°
11x-60° = 11×25 - 60 = 215°
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