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15x = 180°
x = 180°/15 = 12°
B). 2x+3x+80°=180°
5x=100°
x=100°/5 = 20°
C). 5x+4x+90°=180°
9x=90°
x=90°/9 = 10°
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6x +4x +5x=180
15x=180
X=180/15
x=12
B.3x+2x+80=180
5x=180-80
5x=100
X=100/5
X=20
C.4x+5x+90=180
9x=180-90
9x=90
X=90/9
X=10