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2014-04-02T22:08:39+07:00
(a + 2 - 3 , b + 1 + 2) = (1 , 4)
(a - 1 , b + 3) = (1 , 4)

a - 1 = 1
a = 2

b + 3 = 4
b = 1

a - b = 2 - 1 = 1
2 5 2