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2014-10-30T15:30:07+02:00
A+17=83=>a=66
b+36=83=>b=47
c+54=83=>c=29
2014-10-30T15:32:41+02:00
A+b+c=? 
a+17=83 => a=83-17 => a=66 
b+36=83=> b=83-36 => b=47 
c+54=83=> c=83-54 => c=29
 
a+b+c= 66+47+29=142