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2014-02-23T14:59:35+02:00

a+b+c=81a:b=4 (c:b)+4=2
a=bx4
c=bx2+4
b ---
c--- ---+4
a --- --- --- ---
81-4=77 77:7=11 b=11,c=11x2+4=26,a=11x4=44
44+11+26=81

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2014-02-23T15:01:29+02:00
A+b+c=81
a:b=4     a=4b
c:b=2r4   c=2b+4
inlocuim in a+b+c=81
4b+b+2b+4=81
7b+4=81
7b=77
b=77:7   b= 11 
a=4b   a=44
c=2b+4   c= 22+4 = 26