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A+B=5 B+C=7 2A+3B+2C=?

Răspuns :

Răspuns:

A+B=5;A=5-B

B+C=7;B=7-C;B-7=C

2A+3B+2C=2(5-B)+3B+2(B-7)=10-2B+3B+2B-14

=3B-4