639 - a = 286, 636 + b = 921, 429 - c = 117, d - 437 = 179, e + 356 = 877, f - 200 = 456, 567 - g = 234, h + 255 = 678, 978 - i = 346, j - 456 = 231.
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Ismeretlen tag kiszámítása
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