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2014-11-14T19:41:13+02:00
278x3-a=470 
278x3=832 
834-a=470
a=834-470
a=364
195x8=1560
1560+b=2450
b=2450-1560
b=890 
c-(306x7)=420
c-2142=420 c=2142+420 c=2562
d+(315x8)=12300 d+2520=12300 d=12300-2520d=9780