a, \(x=-\dfrac{1}{3}+\dfrac{5}{4}=\dfrac{-4+15}{12}=\dfrac{11}{12}\)
b, \(x=-\dfrac{3}{4}+\dfrac{1}{2}=\dfrac{-3+2}{4}=-\dfrac{1}{4}\)
c, \(\dfrac{x+14}{7}=\dfrac{75}{35}\Rightarrow5x+70=75\Leftrightarrow x=1\)
d, đk : x khác 0
\(\dfrac{2x+3}{x}=\dfrac{13}{x}\Rightarrow2x=10\Leftrightarrow x=5\left(tm\right)\)