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yeah, this is math.
! c" b; a- o: n. o( X4 D; P: |3 v公仔箱論壇0.1x+3y+6z=100 and x+y+z=100.
3 M( l0 f; S( E6 H- R& T; `. p1 E% C3 variables 2 equations, hmmm, very hard to solve.
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