Posted by donald on Friday, October 7, 2011 at 8:42pm.
depends on how you isolate x.
isolate it from the first equation and you have 1/3 * (1-y-2z) + 2y -z = 8
1-y-2z + 6y -3z = 24
5y -5z = 23
Anyway, you end up with (x,y,z) = (15, -6, 11)
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