\[4x + 5;\ 7x - 1;\ \ x^{2} + 2\]
\[7x - 1 = \frac{4x + 5 + x^{2} + 2}{2}\]
\[14x - 2 - 4x - 5 - x^{2} - 2 = 0\]
\[- x^{2} + 10x - 9 = 0\]
\[x^{2} - 10x + 9 = 0,\]
\[x_{1} + x_{2} = 10,\ \ x_{1} \cdot x_{2} = 9\]
\[x_{1} = 9,\ \ x_{2} = 1\]
\[при\ \ x = 9 \Longrightarrow 41,\ \ \ \ 62,\ \ \ 83;\]
\[при\ \ x = 1 \Longrightarrow 9,\ \ \ 6,\ \ \ 3.\]