function equilibrium(sequence s)
atom lower_sum = 0
atom higher_sum = sum(s)
sequence res = {}
    for i=1 to length(s) do
        higher_sum -= s[i]
        if lower_sum=higher_sum then
            res &= i
        end if
        lower_sum += s[i]
    end for
    return res
end function

? equilibrium({-7,1,5,2,-4,3,0})