Elementary Technical Mathematics

$y= \frac{3x}{5}+5$
By adding $3x$ from each side and then dividing each side by $5$, we get $$-3x+5y=25\Longrightarrow 5y=25+3x \\ \Longrightarrow y=\frac{25+3x}{5}=\frac{3x}{5}+5 .$$