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ella [17]
2 years ago
15

A

Mathematics
1 answer:
ludmilkaskok [199]2 years ago
6 0

Answer:

25

Step-by-step explanation:

ABC is a right angle so ABD and DBC are <em>complementary angles</em> and their sum is equal to 90:

x + 55 = 90 subtract 55 from both sides

x = 25

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