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pure math
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[250(80x+1)+2y-250]/2 = (250*80x+2y)/2 = (2000x+2y)/2 = 1000x+y
; e$ ~# A1 v. x公仔箱論壇
- i2 D  K) Z6 V* y  nif x = 111 y = 2222, you number is 111-2222
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