Question

ab+ac+a=165 si b+c=10 aflati a

Answer 1

(ab+ac+a)-(b+c)=a+a+a=165-10=155
3a=155
a=155:3
a=51 (6)
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Answer 2

$ab+ac+a=165 \\ b+c=10 \\ a=? \\ ab+ac+a=165 \\ a(b+c)+a=165 \\ 10a+a=165 \\ 11a=165 \\ a=165:11 \\ \boxed{a=15}$