# Chapter 1 - Section 1.5 - Problem Solving and Using Formulas - Exercise Set - Page 68: 73

$I=\dfrac{E}{R+r}$

#### Work Step by Step

Factor out $I$ on the left side to find: $I(R+r)=E$ Divide by $R+r$ on both sides to find: $\dfrac{I(R+r)}{R+r} = \dfrac{E}{R+r} \\I=\dfrac{E}{R+r}$

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