Question 389568
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Hi
I. Assigning the variable       
Let n represent the number subtacted from mumerator and denominator
II.Writing as we Read***
{{{(29-n)/(37-n) = 5/7}}}
III.Solving for x  by cross multiplying in this case
  5(37-n) = 7(29-n)
     2n = 7*29 - 5*37
     2n = 18
      n = 9, the number subtacted from mumerator and denominator

IV. CHECKING Our Answer***
    20/28 = 5/7