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7654321x + 1234567y = 9876543
------------------------------------------- +
8888888x + 8888888y = 13333332
8888888(x+y)=13333332
x + y = 13333332 : 8888888 = 3/2
7654321x + 1234567y = 9876543
1234567x + 7654321y = 3456789
------------------------------------------- --
6419754x - 6419754y = 6419754
6419754(x - y) = 6419754
x - y = 6419754 : 6419754
x - y = 1
7654321y +1234567x = 3456789
---------------------------------------------------- +
7654321(x + y) + 1234567(x + y) = 13333332
8888888 (x + y ) = 13333332 ----------> (x + y) = 133333332 / 8888888
7654321x + 1234567y = 9876543
7654321y +1234567x = 3456789
-------------------------------------------------- -
7654321(x - y) - 1234567 (x - y) = 6419754
6419754 (x - y) = 6419754
(x - y) = 1
x² - y² = (x + y)(x - y)
= (13333332 / 8888888) (1)
= (133333332 / 8888888)
= 3/2