2.(\(\dfrac{x+3}{5}\)) = 5 - (\(\dfrac{13}{5}\) + x)
MSC = 5
2(\(\dfrac{x+3}{5}\)) = 5 - (\(\dfrac{13}{5}\)+x)
\(\Rightarrow\)\(\dfrac{2\left(x+3\right)}{5}\) = 5 - \(\dfrac{13+5x}{5}\)
\(\Rightarrow\) 2x + 6 = 5 - 13 - 5x
\(\Rightarrow\) 2x + 5x = 5 -13 -6
\(\Rightarrow\) 7x = -14
\(\Rightarrow\) x = -2
Vậy S =\(\left\{-2\right\}\)