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jadi
(5x-3) + (2x+9) + 90 = 180
7x +6 + 90 = 180
7x = 180- 69
7x + 84
x = 84/7 = 12
sudut EOF= COB
2x + 9 = 2 x 12 + 9
= 24 + 9 = 33 derajat