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Step-by-step explanation:
First of all, angle "y" would be 57⁰ as it is a vertically opposite angle (V.O.A)
Then the sum of the angle "y" and that angle with 123⁰ would be 180⁰. That means that l is parallel to m since the sum of those angles is 180⁰, so it is a case of parallelism called "interior supplementary".
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57 digory is same as y so y=to 57 digory
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