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larisa [96]
2 years ago
12

What is the answer to this problem?

Mathematics
1 answer:
Sedaia [141]2 years ago
8 0

Answer:

x = 4.

Step-by-step explanation:

These are exterior  alternate angles which are congruent.

So 21x + 6 = 90

21x = 84

x = 4.

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