Question
The sequence $\frac{2 a-6 b}{3 b}, \frac{2 a-3 b}{3 b}, \frac{2 a}{3 b}, \frac{2 a+3 b}{3 b}, \frac{2 a+6 b}{3 b} \ldots$ is an A.P. with common difference __________.
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