Respuesta:
[tex]4x + 20 = 2 x + 60 \\ 4x - 2x = 60 - 20 \\ 2x = 40 \\ x = 20 ° [/tex]
[tex]y = 180 -( 4 \times 20 + 20 )= 180 - 100 = 80 ° [/tex]
