Giải thích các bước giải:
\(\begin{array}{l}
\left\{ \begin{array}{l}
\frac{{2x}}{5} = \frac{{3y}}{8}\\
\frac{{3y}}{8} = \frac{{5t}}{3}\\
x - 2y + 3t = - 279
\end{array} \right.\\
\to \left\{ \begin{array}{l}
x = \frac{{15}}{{16}}y\\
t = \frac{9}{{40}}y\\
\frac{{15}}{{16}}y - 2y + \frac{{27}}{{40}}y = - 279
\end{array} \right.\\
\to \left\{ \begin{array}{l}
y = 720\\
x = 675\\
t = 162
\end{array} \right.
\end{array}\)
