х - 100 + (46 + 12) = 100
х - 100 + 58 = 100
х = 100 + 100 - 58
х = 142
Проверка:
142 - 100 + (46 + 12) = 100
142 - 100 + 58 = 100
100 = 100
х - 100 + (46 + 12) = 100
х - 100 + 58 = 100
х = 100 + 100 - 58
х = 142
Проверка:
142 - 100 + (46 + 12) = 100
142 - 100 + 58 = 100
100 = 100