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✔ The two lines are parallel.
✔Angle ABC = 105 °
x=?
Angle ABC + angle CBEG= 180° (linear pair)
⟹ Now, the lines are parallel, we know that if two lines are parallel and cut by a transversal, then:-
✔ Corresponding angles are equal.
✔ Alternate angles are equal.
✔ The sum of co-interior angles is 180°
Since, angle CBG and angle DEF are corresponding angles formed on parallel lines,
so, angle DEF = 75°
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