Since R2 and R3 are connected in parallel, we can find their equivalent resistance (R23) using the formula for parallel resistors:
$\frac{1}{R_{23}} = \frac{1}{R_2} + \frac{1}{R_3}$
Now, plug in the values for R2 and R3:
$\frac{1}{R_{23}} = \frac{1}{5} +
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