a: \(\left(\dfrac{1}{2}-x\right)\cdot\dfrac{2}{3}=\dfrac{1}{8}\)
=>\(\dfrac{1}{2}-x=\dfrac{1}{8}:\dfrac{2}{3}=\dfrac{3}{16}\)
=>\(x=\dfrac{1}{2}-\dfrac{3}{16}=\dfrac{8}{16}-\dfrac{3}{16}=\dfrac{5}{16}\)
b: \(3,2x-9,854=-1,246\)
=>\(3,2x=-1,246+9,854=8,608\)
=>\(x=\dfrac{8.608}{3.2}=2,69\)