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x+12+100+x= 180 ( straight line angle)
2x+12=80
X+6=40
x=34 ANS.........
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Answer:
Angle of straight line = 180°
180° = 100° + x + (x + 12°)
180° = 100° + 2x + 12°
180° = 112° + 2x
180° - 112° = 2x
168° = 2x
x = 168/2
x = 84°
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