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2014-07-15T13:43:10+03:00
X+y+z=2970
y=x+210  x=y-210
y=z/2-210  z/2=y+210  z=2(y+210)
y-210+y+2y+420=2970
4y=2970+210-420
4y=2760
y=690    x=480    z=2(690+210)=1800