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      ·  6 years ago 

    3x=9
    x+2y=5
    y+2z=15
    z+y+z=?
    x=9/3=3
    3+2y=5 \\\2y=2\\\y=1
    1+2z=15\\\2z=14\\\z=7
    x+y+z=1+3+7=11.

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      2 votes
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        ·  6 years ago 

      Perfect

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