Respuesta :

TheLazyNobita

Answer:

As the angles are supplementary, their sum is 180

123 + 3x = 180

3x = 57

x = 19

Cathenna

Answer:

x° = 19°

Step-by-step explanation:

[tex] = > 123 \degree + 3x \degree = 180 \degree \\ \\ = > 3x\degree = 180\degree - 123\degree \\ \\ = > 3x\degree = 57\degree \\ \\ = > x\degree = (\frac{57}{3} )\degree \\ \\ = > x\degree = 19\degree [/tex]