реши уравнение 1)(287+икс)- 109=298 2) 374+(икс-129)=702

(287 - х ) - 109 = 298 287 + х  - 109 = 298 х = 298 + 109 - 287 х = 120374 + ( х - 129 ) = 702374  + х - 129 = 702х = 702 - 374 + 129 х = 457

1) (287+х)-109=298.287+х=298+109.287+х=407.х=407-287.х=120.2)374 + (х-129) = 702.374 + х - 129 = 702.245 + х = 702.х=702 - 245.х = 457.