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Supplementary angles = 180°
So, 1st angle = x + 50°
2nd angle = x
x + 50° + x = 180°
2x + 50° = 180°
2x = 180° - 50°
x = 130°/ 2
x = 65°
1st angle = 65 + 50 = 115°
2nd angle = 65°