In this figure, AOB is a straight line. Find x and also the measure of each angle
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(x-9) + (5x+3)=180 (linear pairs)
x-9+5x+3=180
6x = 180 + 9 - 3
6x= 186
x=31
Angle AOB= x-9= 31 - 9= 22
Angle COB= 5x + 3= 157
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