\(\left(\dfrac{1}{4}-3x\right):10=\dfrac{1}{2}-\dfrac{-3}{5}\)
=>\(\left(\dfrac{1}{4}-3x\right):10=\dfrac{1}{2}+\dfrac{3}{5}=\dfrac{11}{10}\)
=>\(\dfrac{1}{4}-3x=\dfrac{11}{10}\cdot10=11\)
=>\(3x=\dfrac{1}{4}-11=\dfrac{1}{4}-\dfrac{44}{4}=-\dfrac{43}{4}\)
=>\(x=-\dfrac{43}{4}:3=-\dfrac{43}{12}\)