1003188906

Let there be planes $\alpha$, $\beta$, $\gamma$ and $\delta$ defined by their general equations: $$\begin{array}{rl}& \alpha :\frac{2}{3}x-4y+6z-\frac{8}{3}=0;\\ & \beta :x-2y+3z-4=0;\\ & \gamma :2x-12y+18z-4=0;\\ & \delta :x-6y+9z-4=0.\end{array}$$ Out of the following statements, select the one that is not true.