Question 402321
{{{1/240+1/252+1/m=1}}}
{{{240=4*60}}}, {{{252=4*63}}}
{{{63/15120+60/15120+1/m=1}}}
{{{1/m=1-123/15120}}}
{{{1/m=(15120-123)/15120}}}
{{{1/m=14997/15120}}}
{{{m=15120/14997}}}
{{{m=5040/4999}}}