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2014-11-11T07:21:03+02:00
300-2•[5•(25^2-624)+x]=220 ;300-2•[5•(625-624)+x]=220; 300-2•(5•1+x)=220; 300-2•(5+x)=220 ; 300-10-2x=220; 290-2x=220 ; 2x=70 ; x=70/2=35
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