TeX джерело:

\normalsize{\;\;\left \{ \begin{array}{rcl}a_{11}x_1\,+\,a_{12}x_2\,+\dots+\,a_{1n}x_n&=&b_1\\a_{21}x_1\,+\,a_{22}x_2\,+\dots+\,a_{2n}x_n&=&b_2\\ \dots\;\dots\;\dots\;\dots\;\dots\;\dots& \dots &\; \\a_{m1}x_1+a_{m2}x_2+\dots+a_{mn}x_n&=&b_m \end{array}\right.}