AngleAOC=(×+39°), angle COD=(×°) and angle BOD=(×-21°)
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x+39+x+x-21=180
3x+18=180
3x=180-18
3x=162
x=162/3=54
x+39=93
x-21=33
3x+18=180
3x=180-18
3x=162
x=162/3=54
x+39=93
x-21=33
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