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A+b=27 b+c=15 a+c=26

Răspuns :

a+b=27
b+c=15
a+c=26
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2xa+2xb+2xc=68
2(a+b+c)=68
a+b+c=34
a+(b+c)=34
a+15=34
a=19
a+c=26
c=7
b+c=15
b+7=15
b=8