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calculeaza 2a+7b+3c daca a+2b=198 si b+c=532

Răspuns :

a=198
b=0
c=532
2*198+7*0+3*532=1992

a+2b=198
a=198-2b

b+c=532
c=532-b

2(198-2b)+7b+3(532-b)=396-4b+7b+1596-3b=1596+396=1992