\(\dfrac{1}{5}.\left(\dfrac{-3-10.5}{5}\right)+5x-x+\dfrac{2}{3}=0\\ \dfrac{1}{5}.\left(-\dfrac{53}{5}\right)+4x+\dfrac{2}{3}=0\\ -\dfrac{53}{25}+\dfrac{2}{3}+4x=0\\ -\dfrac{109}{75}+4x=0\\ 4x=\dfrac{109}{75}\\ x=\dfrac{109}{75}:4\\ x=\dfrac{109}{300}\)