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Mathematics 8 Online
OpenStudy (anonymous):

-x-5y-5z=2 4x-5y+4z=19 x+5y-z=-20 solve each system by elimination

OpenStudy (anonymous):

x,y,z=-2,-3,3

OpenStudy (anonymous):

adding first and third equations eliminates x and y and -6z = -18 so z = -3

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