If the equation of the plane containing the line x+2 y+3 z-4=0=2 x+y-z+5 and perpendicular to the plane r =( i - j )+λ( i + j + k )+μ( i -2 j +3 k )…

If the equation of the plane containing the line $\displaystyle x+2 y+3 z-4=0=2 x+y-z+5$ and perpendicular to the plane $\displaystyle \vec{r}=(\hat{i}-\hat{j})+\lambda(\hat{i}+\hat{j}+\hat{k})+\mu(\hat{i}-2 \hat{j}+3 \hat{k})$ is $\displaystyle a x+b y+c z=4$, then $\displaystyle (a-b+c)$ is equal to