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54321x + 12345y = 87654 x 12345
12345, 54321 x + 54321² y = 45678 . 54321
12345, 54321 x + 12345² y = 87654 . 12345
--------------------------------------------------------------(-)
( - 12345² + 54321²) y = 45678 . 54321 - 87654 . 12345
(54321+12345)(54321-12345) y = (99999-54321)54321 - (99999-12345)(12345)
(66666)(54321-12345) y = 99999(54321-12345) - (54321² - 12345²)
66666 y = 99999 - (54321-12345)
66666 y = 99999 - 54321 +12345
66666 y = 45678+1234
y= 58023/66666= 0.87054