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2014-10-31T11:38:38+02:00
X1=169:13 ; X1=13; X:13•13=169; X2=169:13•13; X2=169; X=2013:2013+2012; X=1+2012; X=2013
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2014-10-31T14:37:03+02:00
13x =169
x=169:13
x=13

2013:(x-2012)=2013
(x-2012)=2013:2013
x-2012=1
x=2012+1
x=2013

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