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rewona [7]
3 years ago
8

Solve for x…………………………..

Mathematics
1 answer:
Georgia [21]3 years ago
6 0

Answer:

15x + 15° = 3x + 9° + 78° (exterior angle is equal to the sum of the opposite interior angles)

15x - 3x = 9° + 78° - 15 °

12x = 72°

12x÷12 = 72°÷12

x = 6

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