D
A
\(\dfrac{2}{3}+\left(\dfrac{5}{8}-\dfrac{3}{4}\right)=\dfrac{2}{3}+\dfrac{-1}{8}=\dfrac{13}{24}\)
\(\dfrac{3}{4}+\left(\dfrac{4}{5}-\dfrac{11}{4}\right):\dfrac{3}{2}=\dfrac{3}{4}+\dfrac{-39}{20}:\dfrac{3}{2}=\dfrac{3}{4}+\dfrac{13}{10}=\dfrac{-11}{20}\)
a) \(x=\dfrac{8}{9}-\dfrac{3}{7}\)
\(x=\dfrac{29}{63}\)
b) \(\dfrac{3}{10}-x=\dfrac{3}{5}:\dfrac{2}{5}\)
\(\dfrac{3}{10}-x=\dfrac{3}{2}\)
\(x=\dfrac{3}{10}-\dfrac{3}{2}\)
\(x=\dfrac{-6}{5}\)
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