a) \(\dfrac{x}{2}=\dfrac{-18}{5}\)
\(\Rightarrow x=\dfrac{\left(-18\right).2}{5}=-\dfrac{36}{5}\)
b) \(x:\left(-\dfrac{1}{2}\right)=\dfrac{5}{8}\)
\(\Rightarrow x=\dfrac{5}{8}.\left(-\dfrac{1}{2}\right)=-\dfrac{5}{16}\)
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