What should be added to (2/3 + 3/5) to get -2/15?

Please find below the solution to the asked query:

Let we add ' x '  to get required fraction , So

$$\begin{gathered} x+\left(\frac{2}{3}+\frac{3}{5}\right) = -\frac{2}{15} \\ \Rightarrow x+\left(\frac{10 + 9}{15}\right) = -\frac{2}{15} \\ \Rightarrow x+ \frac{19}{15} = -\frac{2}{15} \\ \Rightarrow x = -\frac{2}{15}-\frac{19}{15} \\ \Rightarrow x = -\frac{21}{15} \\ \mathbf{\Rightarrow }\mathit{x}\mathbf{ }\mathbf{=}\mathbf{ }\mathbf{-}\frac{\mathbf{7}}{\mathbf{5}}\mathbf{ }\mathbf{ }\mathbf{ }\mathbf{ }\mathbf{ }\mathbf{ }\mathbf{ }\mathbf{ }\mathbf{ }\mathbf{(}\mathbf{ }\mathbf{Ans}\mathbf{ }\mathbf{)} \end{gathered}$$
Hope this information will clear your doubts about topic.