( 31 *550 -х) *120 =10 200
31* 550-х =10 200 :120
17 050 - х=85
х =17 050 - 85
х =16 965
570x-4700=13540
570x=13540+4700
570x=18240
x=32
( 31 *550 -х) *120 =10 200
31* 550-х =10 200 :120
17 050 - х=85
х =17 050 - 85
х =16 965
570x-4700=13540
570x=13540+4700
570x=18240
x=32