Respuesta :

Step-by-step explanation:

x-7+3x+12+x = 180

5x+5=180

5x=175

x = 35°

m L P = x-7 = 35-7 = 28°

m L Q = 3x+12 = 3(35)+12 = 105+12 = 117°

m L R = x = 35°