Giải thích các bước giải:
\(\begin{array}{l}
n.DK:x \ne \pm 5\\
Pt \to \frac{{3.2\left( {x + 5} \right) - 15.6 + 7.2\left( {x - 5} \right)}}{{12\left( {x - 5} \right)\left( {x + 5} \right)}} = 0\\
\to 6x + 30 - 90 + 14x - 70 = 0\\
\to 20x = 130\\
\to x = \frac{{13}}{2}\left( {TM} \right)\\
o.DK:x \ne \pm \frac{1}{2}\\
\frac{{8{x^2}}}{{3\left( {1 - 2x} \right)\left( {1 + 2x} \right)}} = \frac{{2x}}{{3\left( {2x - 1} \right)}} - \frac{{1 + 8x}}{{4\left( {1 + 2x} \right)}}\\
\to \frac{{32{x^2} + 2x.4.\left( {1 + 2x} \right) + 3\left( {1 + 8x} \right)\left( {1 - 2x} \right)}}{{12\left( {1 + 2x} \right)\left( {1 - 2x} \right)}} = 0\\
\to 32{x^2} + 16{x^2} + 8x + 3\left( {1 - 16{x^2} + 6x} \right) = 0\\
\to 48{x^2} + 8x + 3 - 48{x^2} + 18x = 0\\
\to 26x = - 3\\
\to x = - \frac{3}{{26}}\left( {TM} \right)
\end{array}\)
