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Step-by-step explanation:
AOD=DOC & COE=BOE
THEN
AOC+BOC=180
AOC=AOD+DOC & BOC=COE+BOE
AOD+DOC+COE+BOE=180
DOC+DOC+COE+COE=180
2DOC+2COE=180
DOC+COE=180/2
DOC+COE=90
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