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AOE + EOD + DOC = 180
2x + 70 + 90 = 180
2x = 20
x = 10
EOB = 180
EOD + DOC + COB = 180
70 + 90 + (3y - 4) = 180
(3y - 4) = 20
3y = 24
y = 8
Jadi nilai x + y adalah 18