Question

Multimea solutiilor naturale ale inecuatiei 2(x+3)+1<13. Cine mă poate ajuta?

Answer 1

$\displaystyle 2(x+3)+1\ \textless \ 13 \\ 2x+6+1\ \textless \ 13 \\ 2x\ \textless \ 13-6-1 \\ 2x\ \textless \ 6 \\ x\ \textless \ 6:2 \\ x\ \textless \ 3 \\ x \in (- \infty , 3) \\ x \in \{0;1;2\}$