19-03-2021
Mathematics

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devishri1977 devishri1977

20-03-2021

Answer:

Step-by-step explanation:

∠BEF = ∠CFE {Alternate interior angles}

5x - 10 = 4x + 20 {Subtract 4x from both sides}

5x - 4x - 10 = 20

x - 10 = 20 {Add 10 to both sides}

x = 20 +10

x = 30°

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