Respuesta :

Answer:

x = 20

Step-by-step explanation:

The two angles inside the triangle added together equals the one other angle that's outside the triangle. Its called an exterior angle.

42° + 5x + 4 = 7x + 6

combine like terms

5x + 46 = 7x + 6

subtract 5x

46 = 2x + 6

subtract 6

40 = 2x

divide by 2

20 = x

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