$$\left. \begin{array} { l } { ( b ) ( x + 1 ) ^ { 2 } = 7 x } \\ { \quad x ( x - 4 ) = 2 ( x + 7 ) } \end{array} \right.$$
$x=3-\sqrt{23}\approx -1.795831523\text{, }b=\frac{-15\sqrt{23}-67}{7}\approx -19.848210407$
$x=\sqrt{23}+3\approx 7.795831523\text{, }b=\frac{15\sqrt{23}-67}{7}\approx 0.705353264$
