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24 July, 10:57

X-6y-2z = 7

-2x+5y-2z = - 1

-5x+6y+5z = - 6

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  1. 24 July, 11:11
    0
    do you need the value of x?

    x=7+6y+2z

    -2 (7+6y+2z) + 5y+2z=-1 - 7y=13+2z

    -14-12y-4z+5y+2z=-1

    -14-7y-2z=-1

    -7y-2z=-1+14

    -7y-2z=13
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