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2014-04-28T23:50:04+03:00
X-y=10
{x,y}ip{2,3}
2x=3y=k
2x=k⇒x=k/2
3y=k⇒y=k/3
k/2-k/3=10
(3k-2k)/6=10
k/6=10
k=6·10⇒k=60
x=60/2
x=30
y=60/3
y=20
30-20=10