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2014-10-25T10:11:51+03:00
a + b + c = 889
a + 220 = b
b + c = 754

a + b + c = 889 ==> a + 754 = 889 ==> a = 889 - 754 = 135
b = a + 220 ==> b = 135 + 220 = 355
355 + c = 754 ==> c = 754 - 355 = 399
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