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7654321x + 1234567y= 9876543. -----> 1234567y + 7654321x = 9876543
-------------------------------------------------- +
1234567(x+y) + 7654321(x+y) = 13333332
8888888 ( x + y ) = 13333332
(x + y) = 13333332/8888888
(x + y) = 3/2
1234567x + 7654321y = 3456789
1234567y + 7654321x = 9876543
------------------------------------------------- -
1234567(x - y) - 7654321 (x - y) = - 6419754
- 6419754 (x - y) = - 6419754
(x - y) = - 6419754 / - 6419754
(x - y) = 1
x² - y² = (x + y)(x - y)
= (3/2)(1)
= 3/2