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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
; \- t8 y, V! I! Z" Stvb now,tvbnow,bttvb
- x7 N& W' V4 |: K/ Sif x = 111 y = 2222, you number is 111-2222
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