Respuesta :

Step-by-step explanation:

Angle 128 ° + Angle Y = 180 °

Y = 180 - 128

= 52 °

5x + 3 + Y = 180

5x + 3 + 52 = 180

5x + 55 = 180

5x = 180 - 55

5x = 125 °

x = 125 ÷ 5

x = 25

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