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2014-02-07T13:17:43+02:00
10+(a-10)*(380+10*48:4)=1010

10+(a-10)*(380+480:4)=1010

10+(a-10)*(380+120)=1010

10+(a-10)*500=1010

(a-10)*500=1010-10

(a-10)*500=1000

500a-5000=1000

500a=1000+5000

500a=6000


a=12