Three Dimensional Geometry: JEE Mains 2022 June 29 Shift 1

Easy· Distance of a point from a plane or line· +4 / −1
If the mirror image of the point (2,4,7)(2,4,7) in the plane 3x−y+4z=23x-y+4z=2 is (a,b,c)(a,b,c), then 2a+b+2c2a+b+2c is equal to :
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