$$\left. \begin{array} { l } { 4 x + 8 y + 8 y = 1 , 10 x + 1 , 18 = 2 0 = 2 } \\ { 5 x - 6 x + 2 x = 30 x + 2 x = 30 } \\ { x = 6 x + 3 x + 2 x = 30 } \\ { 2 x y ) \right.$$
