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

. . . виды систем линейных уравнений несовместная система линейных уравнений