How to reproduce this example

M = [1 -1;
            1  1]
2×2 Array{Int64,2}:
 1  -1
 1   1

julia> x0 = [1, 3]
2-element Array{Int64,1}:
 1
 3

julia> c = M \ x0
2-element Array{Float64,1}:
 2.0
 1.0

julia> c1, c2 = c;

julia> c1
2.0

julia> c2
1.0
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