Ответ:
\(−4x + 7 + 8.5 = 7.5\).
\(−4x + 15.5 = 7.5\).
\(−4x = 7.5 − 15.5 = −8\).
\(x = 2\).
Проверка: \(−4 \cdot 2 + 7 + 8.5 = 7.5\).
Ответ: \(x = 2\).
\(−4x + 7 + 8.5 = 7.5\).
\(−4x + 15.5 = 7.5\).
\(−4x = 7.5 − 15.5 = −8\).
\(x = 2\).
Проверка: \(−4 \cdot 2 + 7 + 8.5 = 7.5\).
Ответ: \(x = 2\).