[tex] c) \\ \dfrac{2x}{2x+1} = \dfrac{1}{5} \Rightarrow 2x \cdot 5 = 1 \cdot (2x+1) \Rightarrow 10x= 2x+1 \Rightarrow 8x=1 \Rightarrow \boxed{x= \dfrac{1}{8}} \\ \\ d) \\ \dfrac{3x+2}{3x+5}= \dfrac{5}{8} \Rightarrow 8 \cdot (3x+2) = 5 \cdot (3x+5) \Rightarrow 24x+16 = 15x+25 \Rightarrow 24x-15x=25-16 \Rightarrow 9x=9 \Rightarrow \boxed{x=1} [/tex]