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Afla ,,a,, din expresia: a+b+c=69, daca b=19 , c=18

Răspuns :

a+19+18=69 a=69-37 a=32 32+19+18=69
A+b+c=69
B=19
C=18
A+18+19=68
A+37=68
A=68-37
A=31