(223440-130*x)/35=6020
223440-130*x=6020*35
223440-130*x=210700
-130*x=210700-223440
-130*x=-12740
x=-12740/-130
х=98
(31*550-x)*120=10200
31*550-x=10200/120
17050-x=85
-x=85-17050
-x=-16965
x=16965
(223440-130*x)/35=6020
223440-130*x=6020*35
223440-130*x=210700
-130*x=210700-223440
-130*x=-12740
x=-12740/-130
х=98
(31*550-x)*120=10200
31*550-x=10200/120
17050-x=85
-x=85-17050
-x=-16965
x=16965