a) \(\Rightarrow x=\dfrac{15.2}{3}\)
\(\Rightarrow x=10\)
b) \(\Rightarrow x=-\dfrac{21}{13}+\dfrac{8}{13}\)
\(\Rightarrow x=-1\)
c) \(\Rightarrow\dfrac{2}{3}x=\dfrac{3}{5}\)
\(\Rightarrow x=\dfrac{9}{10}\)
d) \(\Rightarrow\dfrac{1}{4}:x=-\dfrac{15}{4}\)
\(x=-\dfrac{1}{15}\)