A2 + B1 = 180
5x+5° + 3x + 15° = 180°
8x + 20° = 180°
8x = 160°
x = 20°
B3 = B1
B3 = 3.20° + 15°
B3 = 60° + 15°
B3 = 75°
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A2 + B1 = 180
5x+5° + 3x + 15° = 180°
8x + 20° = 180°
8x = 160°
x = 20°
B3 = B1
B3 = 3.20° + 15°
B3 = 60° + 15°
B3 = 75°