x = –3
Пошаговое объяснение:
(5 – 3x) / 7 = 5 + x
5 – 3x = (5 + x) · 7
5 – 3x = 35 + 7x
7x + 3x = 5 – 35
10x = –30
Проверка:
(5 – 3·(–3)) / 7 = 5 + (–3)
(5 + 9) / 7 = 5 – 3
2 = 2
