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∡AOC=∡BOC=70°
Luego:
∡AOC=70°
2y-20°=70°
2y=90°
y=45°
∡BOC=70°
x+10°=70°
x=60°
2y-20+x+10=140
x+10+x+10=140
2x+20=140
2x=140-20=120
x=60
2y-20=60+10
2y=70+20=90
y=45