Alright, lets get started.
Grey and white both color pigeons are sitting on a wire.
Suppose number of white pegions = x
The number of grey pigeons on a wire is 6 times the number of white pigeons.
It means number of grey pegions = 6x
So, total number of pegions will be =
total number of pegions will be = 7 x
Hence the expression would be 7 x : Answer
Hope it will help :)