Đặt \(z=x+yi\)
\(\Rightarrow\left(2-i\right)\left(x-yi\right)+\left(4+3i\right)\left(x+yi\right)=7-4i\)
\(\Leftrightarrow2x-y-\left(x+2y\right)i+4x-3y+\left(3x+4y\right)i=7-4i\)
\(\Leftrightarrow6x-4y+\left(2x+2y\right)i=7-4i\)
\(\Rightarrow\left\{{}\begin{matrix}6x-4y=7\\2x+2y=-4\end{matrix}\right.\) \(\Rightarrow\left\{{}\begin{matrix}x=-\dfrac{1}{10}\\y=-\dfrac{19}{10}\end{matrix}\right.\)
\(\Rightarrow z=-\dfrac{1}{10}-\dfrac{19}{10}i\)
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