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21-11-2020
Mathematics

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KurdishPotato KurdishPotato

21-11-2020

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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