Дана система линейных уравнений:

\(\displaystyle \left\{ \begin{aligned} {\small \frac{3}{10}}s+4t=&{\small -\frac{9}{10} }{\small , }\\ 7s-12t=&14{\small . } \end{aligned} \right. \)

Умножьте первое уравнение на \(\displaystyle 20{\small : }\)

\(\displaystyle \left\{ \vphantom{\begin{aligned} 1\\[5px] 1 \end{aligned}} \right. \)	[ ]\(\displaystyle =\)[ ]\(\displaystyle {\small , }\)
	\(\displaystyle 7s-12t=14{\small . }\)