\(ĐK:x\ne\pm5\)
\(\Leftrightarrow\dfrac{\left(x+5\right)\left(x+5\right)-\left(x-5\right)\left(x-5\right)}{\left(x-5\right)\left(x+5\right)}=\dfrac{3}{\left(x-5\right)\left(x+5\right)}\)
\(\Leftrightarrow\left(x+5\right)^2-\left(x-5\right)^2=3\)
\(\Leftrightarrow x^2+10x+25-x^2+10x-25=3\)
\(\Leftrightarrow20x=3\)
\(\Leftrightarrow x=\dfrac{3}{20}\)


