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Answer:
x = 145°
Step-by-step explanation:
We know that y = 98°, so we can find ∠DBC:
180°-y = ∠DBC
180°-98° = 82°
We also know that z = 63°, therefore we can apply exterior angle of triangles to find x.
∠DBC + z = x
82°+63° = x
x = 145°