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$(\frac{1}{5} - 2x)^2 = (\frac{3}{5})^2$

Trường hợp 1:

$\frac{1}{5} - 2x = \frac{3}{5}$

$-2x = \frac{3}{5} - \frac{1}{5}$

$-2x = \frac{2}{5}$

$x = \frac{2}{5} : (-2)$

$x = -\frac{1}{5}$

Trường hợp 2:

$\frac{1}{5} - 2x = -\frac{3}{5}$

$-2x = -\frac{3}{5} - \frac{1}{5}$

$-2x = -\frac{4}{5}$

$x = -\frac{4}{5} : (-2)$

$x = \frac{2}{5}$