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2014-03-12T22:02:47+02:00
X/7 = y/3 = z
8x-5y=2
x/7 = y/3
x/y = 7/3 ⇒ x=7K
                  y=3K
56K-15K=2
41K=2
K=20,5
x=143,5
y=61,5
x/7=z
x/z=7 ⇒ x=7K
              y=K
y=20,5
xyz = 143,5·61,5·20,5 = 180917,625