Let $R$ be any ring and let any set of elements $S\subset R$ (proper) be such that $0_R,1_R\in S$ with some other elements of $R$. Now, define $$I:=\langle R\setminus S\rangle=\langle\{a\in R: a\notin S\}\rangle.$$ That is, $I$ is generated by the set of elements not in $S$.
Question: Is there a possibility some left ideal $Rx$ to be contained in $I$ for some nonzero $x\in S$?
Let $R=\mathbb{Z}$ and $S=\mathbb{Z}\setminus\{2\}$. Then $I=2\mathbb{Z}$ and $4\in I\cap S$.