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