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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