Respuesta :

Answer:

x=3

Step-by-step explanation:

40x + 120 = 20x + 180

(40x - 20) + 120 = (20x- 20) + 180

= 20x + 120 = 180

20x + (120-120) = 180 - 120

20x = 60

divide 20 to both sides of 20 and 60 so you will get x=3