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math magician

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x+y=2000 .03x+.05y=84 x+y=2000 -x -x y=-x+2000 y=-(800)+2000 .03x+.05(-x+2000)=84 y=1200 .03x+ -.05x +100=84 -.02x+100=84 -100 -100 -.02x=-16 ----------- -.02x x= 800

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