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2014-03-20T17:05:20+02:00
X- Pret
x+10x/100=A - noul pret
A-15A/100=187
100A-15A=18700
85A=18700
A=18700:85
A=220

x+10x/100=220
x+x/10=220
10x+x=2200
11x=2200
x=2200:11
x=200