Hi,

x+5y-4z=-10

2x-y+5z=-9    ||eliminating z

 13x + 21 y = -86

2x-y+5z=-9

2x-10y-5z=0   ||eliminating z

 4x - 11y = -9 

 13x + 21 y = -86

   21x = -105,  x = -5   and y = -1  and z = 0 

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