a: \(=\left(6+\dfrac{1}{3}+2+\dfrac{2}{3}\right)+\left(-3-\dfrac{2}{5}-1-\dfrac{3}{5}\right)+4=9-5+4=8\)
b: \(=\dfrac{5}{6}-\dfrac{1}{9}+\dfrac{4}{5}-\dfrac{4}{6}-\dfrac{7}{9}+\dfrac{3}{5}+\dfrac{3}{5}-\dfrac{1}{9}-\dfrac{1}{6}\)
=-1+2=1
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