Question

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

Answer 1

(287 - х ) - 109 = 298
 287 + х  - 109 = 298
 х = 298 + 109 - 287
 х = 120


374 + ( х - 129 ) = 702
374  + х - 129 = 702
х = 702 - 374 + 129 
х = 457

Answer 2

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.