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Marrrta [24]
3 years ago
9

Please help! Thanks thO!

Mathematics
1 answer:
Snezhnost [94]3 years ago
7 0

Answer:

8

Step-by-step explanation:

The sum of two interior angles in a triangle is equal to an exterior angle

7x - 4 + 9x + 4 = 128° add like terms

16x = 128 divide both sides by 16

x = 8

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