Question

14 задание. Помогите.

Answer 1

$-3 \leq \frac{5-2a}{3} \ \textless \ 1 \\ \\ -9 \leq 5-2a\ \textless \ 3 \\ \\ -14 \leq -2a \ \textless \ -2 \\ \\ 2 \ \textless \ 2a \leq 14 \\ \\ 1\ \textless \ a \leq 7 \\ \\ 2+3+4+5+6+7=27$