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2014-05-14T16:50:52+03:00
X + y / 2 = 3,09
x + y = 6,18
x = 2 y => 2 y + y = 6,18
3 y = 6,18 / :3
y = 2,06
x = 2 y => x = 2 · 2,06
x = 4,12
1 5 1