first off, let's change the mixed fraction to "improper", and do the division then.
[tex]\bf \stackrel{mixed}{-5\frac{3}{14}}\implies -\cfrac{5\cdot 14+3}{14}\implies \stackrel{improper}{-\cfrac{73}{14}}\implies -73\div 14\approx -5.21428571
\\\\\\
-5.\stackrel{tenth}{2}~\stackrel{hundreth}{1}~\stackrel{thousandth}{4}[/tex]
