a+ b=55, b+c = 93, c+a= 74

a+ b=55
b+c = 93
c+a= 74
le adunam
a+b+b+c+c+a=55+93+74
2(a+b+c)=222
a+b+c=111
a=111-93=18
b=111-74=37
c=111-55=56

Le adunam pe cele trei relatii:
2(a+b+c)=55+93+74
a+b+c=222:2=111
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b=55-a
c=74-a si inlocuim in relatia de mai sus:
a+ 55- a +  74 - a = 111
-a= 111- 129
-a = -18
a=18
b=55-18= 37
c=74-18=56.
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Succes in continuare!