a: \(=\dfrac{2^5\cdot\left(9-2\right)}{2^5\left(5+9\right)}=\dfrac{7}{14}=\dfrac{1}{2}\)
b: =1/3-1/7=4/21
c: \(=\dfrac{32}{56}-\dfrac{35}{56}-\dfrac{6}{56}=\dfrac{-9}{56}\)
d: \(=\dfrac{-39}{90}+\dfrac{34}{90}-\dfrac{35}{90}=-\dfrac{40}{90}=-\dfrac{4}{9}\)
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