What is missing (1000)

What number is to add to get 1000?

Result

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

Solution:

Solution in text x207 =
Solution in text x163 =
Solution in text x419 =
Solution in text x977 =
Solution in text x27 =







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