Let he amount of what Jim has be #color(green)x#
Carmen has #7# less than Jim so he has #color(green)xcolor(red)(-7)#
Tom has #3# times what Jim has so he has #color(blue)3color(green)x#
The total is #73# so,
#x+(x-7)+3x=73#
#x+x-7+3x=73#
Add like terms (#x# terms together)
#5x-7=73#
Add #7# to both sides
#5xcancel(-7+7)=73+7#
#5x=80#
Divide both sides by #5#
#x=16#,
Now Jim has #x# so he has #color(magenta)16#
Carmen has #7# less than Jim so he has #16-7# which is #color(magenta)9#
Tom has #3# times Jim so he has #3(16)# which is #color(magenta)48#.
To check your answer add those values together, they must sum up to #73#
#color(magenta)48+color(magenta)9+color(magenta)16=73#, so the answer is correct