B/34a-b/51a

To simplify the expression b/34a - b/51a, we need to find a common denominator. The common denominator in this case is 34a * 51a.

So, let's rewrite the expression with the common denominator:

(b * 51a - b * 34a) / (34a * 51a)

Now, we can simplify the numerator:

(51ab - 34ab) / (34a * 51a)

Simplifying further:

(17ab) / (34a * 51a)

Now we can cancel common terms:

17 / (34 * 51a)

Simplifying the denominator:

17 / (1734a)

The simplified expression is 17 / (1734a).