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pure math
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[250(80x+1)+2y-250]/2 = (250*80x+2y)/2 = (2000x+2y)/2 = 1000x+ytvb now,tvbnow,bttvb% I, ^) N& I  j* P+ s. A
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if x = 111 y = 2222, you number is 111-2222
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