\(a,\dfrac{7}{20}-x=\dfrac{1}{10}\\ \Rightarrow x=\dfrac{7}{20}-\dfrac{2}{20}\\ \Rightarrow x=\dfrac{1}{4}\\ b,\left(x:\dfrac{5}{3}-\dfrac{2}{3}\right).\dfrac{1}{2}+\dfrac{3}{4}=1\dfrac{1}{12}\\ \Rightarrow\left(x:\dfrac{5}{3}-\dfrac{2}{3}\right).\dfrac{1}{2}+\dfrac{3}{4}=\dfrac{13}{12}\\ \Rightarrow\left(x:\dfrac{5}{3}-\dfrac{2}{3}\right).\dfrac{1}{2}=\dfrac{1}{3}\\ \Rightarrow x:\dfrac{5}{3}-\dfrac{2}{3}=\dfrac{2}{3}\\ \Rightarrow x:\dfrac{5}{3}=\dfrac{4}{3}\\ \Rightarrow x=\dfrac{20}{9}\)
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