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Step-by-step explanation:
|OMN = x [ vertically opposite angles ]
|MON = x [ vertically opposite angles ]
in ∆ OMB, |ONM + |OMN + |MON = 180°
therefore |ONM = 180° - [|OMN + MON ]
=> |ONM = 180° - [ x + x ]
=> |ONM = 180 - 2x°
but |ONM = |ENB = 180° - 2x
[ vertically opposite angles ]
therefore |ENB = [180° - 2x]
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