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6x-2y+3z=17Ix1I6x-2y+3z=17
____________-
17y=34
y=2
3x+4y-5z=12 Ix5I 15x+20y-25z=60
2x+5y+z=17 Ix4I 8x+20y+4z=68
____________-
7x-29z=-8
3x+4y-5z=12 Ix1I 3x+4y-5z=12
6x-2y+3z=17 I-2I -12x+4y-6z=-34
_____________-
15x+z=46
7x-29z=-8 Ix1 I 7x-29z=-8
15x+z=46 Ix-29I -435x-29z=-1334
______________-
442x=1326
x=3
15(3)+z=46
45+z=46
z=1