Eq. 1 : `5x-3y+2z=3`
Eq. 2 : `2x+4y-z=2`
Eq. 3 : `x+y-z=-1`
Multiply Eq. 2 by 2 and add Eq. 1,
`4x+8y-2z=4`
`5x-3y+2z=3`
Eq.4 : `9x+5y=7`
Subtract Eq. 3 from Eq. 2,
Eq.5 : `x+3y=3`
Now let's solve Eq.4 and Eq.5 by substitution method,
From Eq.5 ,
`x=3-3y`
Substitute the above expression of x in the Eq.4,
`9(3-3y)+5y=7`
`27-27y+5y=7`
`27-22y=7`
`-22y=7-27`
`-22y=-20`
`y=(-20)/-22`
`y=10/11`
Plug in the value of y in the expression of x,
`x=3-3y`
`x=3-3(10/11)`
`x=3-30/11`
`x=(33-30)/11`
`x=3/11`
Plug in the values of x and y in the Eq.3,
`3/11+10/11-z=-1`
`13/11-z=-1`
`-z=-1-13/11`
`-z=(-11-13)/11`
`-z=(-24)/11`
`z=24/11`
Solutions of the equations are x=3/11 , y=10/11 and z=24/11
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