(I believe I did it correctly, but you might need to double check)
assuming that the question is
34/5 /x = 25/7
you have to isolate x to find its value.
so, to get rid of the denominator in the first fraction by multiplying 34/5 x x/1 (it is the same as division of fractions)
then you get: 34x/5 = 25/7
then, you would have to get rid of the denominators by multiplying both sides by 5 and 7, which will give you
238x = 125.
and then to get x, you divide 125 by 238. It isn't a nice number but that's how I did it.