a)\(\dfrac{x}{27}=\dfrac{-2}{3,6}\)
\(\Rightarrow\dfrac{x}{27}=\dfrac{-15}{27}\)
\(\Rightarrow x=-15\)
a, \(3,6x=27.\left(-2\right)\)
\(3,6x=-54\)
\(\Rightarrow x=-15\)
b, \(-\dfrac{13}{25}:x=-\dfrac{234}{25}:\dfrac{819}{50}\)
\(-\dfrac{13}{25}:x=-\dfrac{4}{7}\)
\(\Rightarrow x=\dfrac{91}{100}\)