Đáp án:
\(x = \pm 5\)
Giải thích các bước giải:
\(\begin{array}{l}
\left| {2x} \right| - \left| {3,5} \right| = \left| { - 6,5} \right|\\
\left| {2x} \right| - 3,5\,\,\, = 6,5\\
2\left| x \right|\,\,\,\,\,\,\,\,\,\,\,\,\,\, = 6,5 + 3,5\\
2\left| x \right|\,\,\,\,\,\,\,\,\,\,\,\,\,\, = 10\\
\left| x \right|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\, = 5\\
x\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\, = \pm 5
\end{array}\)
