458(8+7+x) = 0
232*(15+x) = 0
3480+232x = 0
232x = -3480
x = -3480/232
x = -15
Проверка:
458(8+7-15) = 0
4580 = 0
0 = 0
Ответ: x = -15
458(8+7+x) = 0
232*(15+x) = 0
3480+232x = 0
232x = -3480
x = -3480/232
x = -15
Проверка:
458(8+7-15) = 0
4580 = 0
0 = 0
Ответ: x = -15