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2014-11-10T20:24:58+02:00
X - pret initial

x+4x/100=A  A reprez noul pret dupa scumpire
A-5A/100=494
100A-5A=49400
95A=49400
A=520

x+4x/100=520
100x+4x=52000
104x=52000
x=500
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