Question

(89315-y)-12974=46138

Answer 1

89315 - Y - 12974 = 46138
Y = 89315 - 12974 - 46138
Y = 30203

Answer 2

(89315-у)-12974=46138
89315-у-12974=46138
-у=46138-89315+12974
-у=-30203
у=30203
Проверка:
(89315-30203)-12974=46138
46138=46138