Question 1144061
r, the one-man digging rate

{{{system((6r)4=3,(10r)*x=7)}}}


{{{(10r*x)/(6*4*r)=7/3}}}


{{{(10/(6*4))x=7/3}}}


{{{(10/(2*3*4))x=7/3}}}


{{{(5/4)x=7}}}


{{{x=28/5}}}

{{{x=5&3/5}}}


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(number seems strange.  Look for any mistakes in steps.)