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daca a-b=7 si a+b+2c=53, atunci b+c=?

Răspuns :

A=b+7 B+7+b+2c=53 2b+2c=46/2 B+c=23
a=7+b
7+b+b+2c=53
1.
2b+2c=46 /:2
b+c=23
2.
2b+2c=46 
2(b+c)=46 /:2
b+c=23