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2014-11-02T20:25:25+02:00
|x-3|-5 apartine { -4,4 } |+5
|x-3| apartine {1,9}
x-3 apartine {-1,1,-9,9} | +3
x apartine { 2,4,-6.12 } 
2 5 2
2014-11-02T20:26:32+02:00