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$$\large{\begin{gather*}\normalsize\begin{cases}a_{11}x_{1}+a_{12}x_{2}+a_{13}x_{3}=b_{1}\\a_{21}x_{1}+a_{22}x_{2}+a_{23}x_{3}=b_{2}\\a_{31}x_{1}+a_{32}x_{2}+a_{33}x_{3}=b_{3}\\a_{41}x_{1}+a_{42}x_{2}+a_{43}x_{3}=b_{4}\\a_{51}x_{1}+a_{52}x_{2}+a_{53}x_{3}=b_{5}\\a_{61}x_{1}+a_{62}x_{2}+a_{63}x_{3}=b_{6}\\a_{71}x_{1}+a_{72}x_{2}+a_{73}x_{3}=b_{7}\end{cases}\\ \\\color{#ff7800}a_{mn},\quad m > n\end{gather*}}$$

. . . виды систем линейных уравнений несовместная система линейных уравнений