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2014-10-16T21:57:02+03:00
X=17-2y
y=4+3z
-3z=4-y⇒z= \frac{4-y}{-3}
2(17-2y)+4(4+3z)*17-2y+4(4+3z)-6( \frac{4-y}{-3} )
34-4y+16+12z*17-2y+16+12z-6/ \frac{4-y}{-3} =34+16*17+16-6/ \frac{4-y}{-3} -4y+12z-2y+12z= \frac{-645}{1-y} -6y+24z;