\(a,\dfrac{3}{5}-\dfrac{-7}{10}-\dfrac{13}{-20}\)

\(b,\dfrac{3}{4}+\dfrac{-1}{3}-\dfrac{5}{18}\)

\(c,\dfrac{3}{13}-\dfrac{5}{-8}+\dfrac{-1}{2}\)

\(d,\dfrac{1}{2}+\dfrac{1}{-3}\)

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