Respuesta :

DE + EF = DF
2(x+3) + 3(x-1) = 138
2x+6 + 3x-3 = 138
5x=135
x=27
DE Is 60 and ef is 78

4x+7=5x-4
x=11

3 is 78°
This is the solution in the image. Hope this helps
Ver imagen matthavan