$\frac{\left|21\right|}{\left|5x\right|}=3.\ \left|\frac{7}{5x}\right|$

$\frac{\left|18x\right|}{\left|5\right|}=3.\ \left|\frac{6}{5x}\right|$

$\frac{\left|21\right|}{\left|5x\right|}=3.\ \left|\frac{7x}{5x}\right|$

$\frac{\left|11\right|}{\left|2x\right|}=2x.\ \left|\frac{11}{1}\right|$

$\frac{\left|25\right|}{\left|4x\right|}=5x.\ \left|\frac{5}{4x}\right|$