# Chapter 2 - Section 2.4 - Formulas and Percents - Exercise Set - Page 152: 19

$$a = 2A - b$$

#### Work Step by Step

To solve this equation for $a$, we need to isolate $a$. We first divide both sides by $\frac{1}{2}$, which means we will multiply each side by the inverse, which is $2$: $$2A = a + b$$ We then subtract $b$ from each side: $$a = 2A - b$$

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