# Chapter 2 - Section 2.3 - Formulas and Problem Solving - Exercise Set: 17

$r=\frac{E-IR}{I}$

#### Work Step by Step

We are given that $E=I(r+r)$. We can use the distributive property to multiply out the terms on the right side. $E=I\times(r+r)=Ir+IR$ Subtract IR from both sides. $E-IR=Ir$ Divide both sides by I. $r=\frac{E-IR}{I}$

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