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2014-11-07T19:32:53+02:00
A) f+b = 27 
b) f+b=27
   b= 17  => f+7=27 => f= 27-17 => f= 10
c) f + b= 27
   f=15 => 15+ b = 27 => b = 27-15 => b = 12
2014-11-07T19:32:56+02:00