600-120+x*6=600
помогите пожалуйста решить)

600-120+х*6=600                1260+2*x=3000480+6х=600                         1260+2х=30006х=600-480                          2х=3000-12606х=120                                 2х=1740х=120:6                                х=1740:2 х=20                                     х=870