Question

$$\left. \begin{array} { l } { ( x - 1 ) ^ { 2 } - 2 x + y = 6 x + 6 x + 6 y = 8 } \\ { 1 x ^ { 2 } + 15 x + 6 = 6 x + 6 x + 6 x = 16 } \\ { 15 x + 6 x + 6 x = 5 x + 6 x = 6 x + 6 x = 6 x \right.$$