[tex]\sf\dfrac{3}{5}(3y+15)[/tex]
Distribute 3/5:
[tex]\sf\dfrac{3}{5}\times3\rightarrow\dfrac{3\times3}{5}\rightarrow\dfrac{9}{5}[/tex]
[tex]\sf\dfrac{3}{5}\times15\rightarrow\dfrac{3\times15}{5}\rightarrow\dfrac{45}{5}\rightarrow9[/tex]
So we have:
[tex]\boxed{\sf\dfrac{9}{5}y+9}[/tex]
