These triangles are similar what is the value of x
The sides are being multiplied by $5$, so $3x+8=4*5=20\implies 3x=12\implies\boxed{x=4}$.
\(\frac{3x+8}{15} = \frac{4}{3}\)
\(\frac{3x+8}{15} = \frac{20}{15}\)
3x + 8 = 20
3x = 12
\(\boxed{x = 4}\)
+605 
+1223 
