Respuesta :

Step-by-step explanation:

m∠3+ m∠5 = 180° (co-int angles are supplementary)

5x+ 10 + 3x + 10 = 180° (co-int ∠'s, parallel lines)

8x + 20 = 180

8x = 160

x= 160/8

x= 20°

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