Answer:
x = 18
Explanation:
∠ BCD and ∠ ABC are alternate angles and are congruent , that is
∠ BCD = 2x
∠ BCD and ∠ CDE are same- side interior angles and sum to 180° , then
2x + 8x = 180
10x = 180 ( divide both sides by 10 )
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