\[\frac{x - 3y}{y} = 12 \Longrightarrow \frac{x}{y} - \frac{3y}{y} =\]
\[= 12 \Longrightarrow \frac{x}{y} - 3 = 12 \Longrightarrow \frac{x}{y} =\]
\[= 15 \Longrightarrow x = 15y\]
\[\frac{5x - 3y}{2y} = \frac{5x}{2y} - \frac{3y}{2y} =\]
\[= 2,5 \cdot \frac{x}{y} - 1,5 = 2,5 \cdot 15 - 1,5 =\]
\[= 36\]