Evaluate $6+5-4\times 3\div (2+1).$
First, we perform the operation in parentheses: \[6+5-4\times 3\div (2+1) = 6+5-4\times 3\div 3.\] Then, we perform multiplication and division, going from left to right: \begin{align*}
6+5-4\times 3\div 3 &= 6+5-12 \div 3 \\
&=6+5-4.
\end{align*} Finally, we perform addition and subtraction, going from left to right, to get our answer: \begin{align*}
6+5-4 &= 11-4 \\
&=\boxed{7}.
\end{align*}