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Geometric triangle with labeled angles including 20°, 40°, 120°, 140°, 15°, and x°.

A geometric diagram showing a triangle with angles labeled 20°, 40°, 120°, 140°, 15°, and x°, illustrating angle relationships in a complex figure.

A geometric diagram showing a triangle with angles labeled 20°, 40°, 120°, 140°, 15°, and x°, illustrating angle relationships in a complex figure.

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