Question 1169328
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Susan has  7x dollars;  Tommy has 3x dollars.



The governing equation is

    7x - 3x = 48   dollars.



which implies

    4x      = 48

     x      = 48/4 = 12.



<U>ANSWER</U>.  The dollars are  7*12 = 84 (Susan) and  3*12 = 36 (Tommy).
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Solved.