The Divide Node's Two Gradients

Backpropagation is run on the graph below. Its two inputs are $a$ and $b$:

Two features make this graph more than a straight chain:

• $u$ is used twice — once by the squaring node and once directly by the final sum.
• $a$ reaches the rest of the graph by two arrows, one into $u$ and one into $v$.

The graph is evaluated at

$a = 2, \qquad b = 3$

What is $\dfrac{\partial L}{\partial a}$ at that point? Round your answer to 2 decimal places.