Question

daca ab+ac=7 si b+c=3,aflati a

Answer 1

ab+ac=7 => a(b+c)=7 => a·3=7 => a=$\frac{7}{3}$

Answer 2

ab+ac=7
b+c=3
⇒a[b+c]=7
⇒a·3=7
⇒a=7/3
⇒a=2,[3];