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2014-05-26T14:48:39+03:00
X+y+z = 140
y = 2x
z = x/2
 inlocuim
x + 2x + x/2 =140
2x + 4x +x = 280
7x = 280
x = 280/7
x = 40
y = 2*40
y = 80
z = 40/2
z =20