Let P be the plane passing through the line (x-1)/1=(y-2)/-3=(z+5)/7 and the point (2,4,-3). If the image of the point (-1,3,4) in the plane P is (α,…

Let P be the plane passing through the line $\displaystyle \frac{x-1}{1}=\frac{y-2}{-3}=\frac{z+5}{7}$ and the point $\displaystyle (2,4,-3)$. If the image of the point $\displaystyle (-1,3,4)$ in the plane P is $\displaystyle (\alpha, \beta, \gamma)$ then $\displaystyle \alpha+\beta+\gamma$ is equal to