Respuesta :

akposevictor

Answer:

x = 6

Step-by-step explanation:

To find x, create an equation and solve for x.

60° + 90° + (7x - 12)° = 180° (sum of triangle theorem)

60 + 90 + 7x - 12 = 180

Add like terms

138 + 7x = 180

7x = 180 - 138

7x = 42

x = 42/7

x = 6