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Step-by-step explanation:
3X-42=2x+13(since they are vertically opposite angles they are equal)
3x-2x=13+42
x=55 degree
3x-42=z(corresponding angles r equal)
3into55 -42=z
165-42=z
123degree=z OR z=y
now,3x-42=y(v.o.a are equal) y=123 degree(since alt
3into 55-42 =y angles r equal if the lines r parallel)
123 degree =y
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