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Two angles in a diagram are supplementary. If <1 = 77°, what equation can you write to solve for <2?

A: x = 90° - 77°B: x + 77° = 90°

B: x + 77° = 90°C: x = 77°

C: x = 77°

D: x + 77° = 180°

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D: x + 77° = 180°

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