What is missing (1000)

What number is to add to get 1000?

Correct result:

x207 =  793
x163 =  837
x419 =  581
x977 =  23
x27 =  973

Solution:

$x_{207}=1000-207=793$
$x_{163}=1000-163=837$
$x_{419}=1000-419=581$
$x_{977}=1000-977=23$
$x_{27}=1000-27=973$

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