\[a(x + 1) = 5\]
\[x + 1 = \frac{5}{a}\]
\[x = \frac{5}{a} - 1.\ \]
\[\frac{5}{a} - 1^{\backslash a} > 0\]
\[\frac{5 - a}{a} > 0\ \ \ \ \ \ | \cdot ( - 1)\]
\[\frac{a - 5}{a} < 0\]
\[0 < a < 5\]
\[a = 1;2;3;4.\]
\[Ответ:при\ a = 1;2;3;4.\]