In this sequence there are actually two sequences. 1 sequence for the numerators and one sequence for the denominators. The following transformation applies to the sequence for the denominators : -4
This creates the following sequence: [-10, -14, -18, -22, -26]
The following transformation applies to the sequence for the numerators: +10
This creates the following sequence: [6, 16, 26, 36, 46]
Take a good look at how to rewrite the fractions in the series to recognize the pattern.
For example, -5/3 can be rewritten as -10/6