Thay \(x=1\) vào phương trình đã cho, ta có:
\(3\left(2\cdot1+m\right)\left(3\cdot1+2\right)-2\left(3\cdot1+1\right)^2=43\)
\(\Leftrightarrow15\left(2+m\right)-2\cdot16=43\)
\(\Leftrightarrow30+15m-32=43\)
\(\Leftrightarrow15m=45\)
\(\Leftrightarrow m=3\)