Equation of Plane through Mirror Image and Line

If the equation of plane passing through the mirror image of a point (2,3,1) with respect to line ‌

x+1

2

=‌

y−3

1

=‌

z+2

−1

and containing the line ‌

x−2

3

=‌

1−y

2

=‌

z+1

1

is αx+βy+γz=24, then α+β+γ is equal to