Question 1109838
Simply draw the number line and plot the values.  Common denominator is 21, so you may show as {{{-9/21}}} and {{{-14/21}}}.  You can compute the difference, or count directly on the number line.


{{{number_line(500,-1.5,0.5,-3/7,-2/3)}}}


{{{number_line(500,-1.5,0.5,-9/21,-14/21)}}}