Respuesta :

Answer:

x=-4.44

Step-by-step explanation:

3x - 40x + x + 20 = 180

3x - 40x + x + 20 - 20 = 180 - 20   =  

3x - 40x + x = 160

-36x = 160

-36x/-36 = 160/-36

x = -4.44