Question

уравнения (287+x)-109=298;374+(x-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

(287+х)-109=298
287+х=109+298
287+х=407
х=407+287
х=120

374+(х-129)=702
х-129=702-374
х-129=328
х=328+129
х=457