$$\left. \begin{array} { l } { \quad x + x + 1 , 1 } \\ { 2 x + 1 , 1 = 69 } \\ { 2 x + 2 x = 69 } \\ { 2 x \right.$$
$\text{false},\ x=\frac{69}{4},\ y=2x+1,\ z=1,\ a=2x+1,\ b=2x$
