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**Circuit Resistance Problem!!**

## Homework Statement

The equivalent resistance between points A and B of the resistors shown in the figure below is 40 . Find the value of resistance R.

## Homework Equations

All circuit formulas.

## The Attempt at a Solution

40 - 12 = 28

28 = [(1/55) + (1/R)]^-1

R = -27

Help!