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2014-09-18T10:12:13+03:00
X/2=y/3=z/4
2x+y-5z=81
6x=4y=3z
6x=4y,x=4y/6,4y=3z,y=3z/4
8y/6+y-20y/3=81
8y+6y-40y=486
-26y=486
y=-18,69


6x=4y,6x=4x(-18,69)=-74,76,x=-12,46
2x+y-5z=81
-24,92-18,69-5z=81
-43,61-81=5z
-1`24,61=5z
z=-24,92

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