ОГЭ по математике. №9 Линейные уравнения. ФИПИ. Задача 23

ОТВЕТ: \(-5,8.\)

\(5\left( {x + 4} \right) = -9\,\,\,\,\,\, \Leftrightarrow \,\,\,\,\,\,5x + 20 = -9\,\,\,\,\,\, \Leftrightarrow \,\,\,\,\,\,5x = -9-20\,\,\,\,\,\, \Leftrightarrow \)

\( \Leftrightarrow \,\,\,\,\,\,5x = -29\,\,\,\,\,\, \Leftrightarrow \,\,\,\,\,\,x = -\dfrac{{29}}{5}\,\,\,\,\,\, \Leftrightarrow \,\,\,\,\,\,x = -5\dfrac{4}{5}\,\,\,\,\,\, \Leftrightarrow \,\,\,\,\,\,x = -5,8.\)

Ответ: \(-5,8.\)