Chapter 1 - Expressions, Equations, and Inequalities - 1-4 Solving Equations - Practice and Problem-Solving Exercises - Page 31: 59

$x=\frac{10c}{a}$

We can eliminate fractions by multiplying both sides of the equation by the LCM of the denominators. So, we multiply the entire equation by 5. That gives us $3ax-20c=ax$. We subtract both sides by 3ax to simplify. We have $-20c=-2ax$. To isolate x, we divide both sides by -2a. That gives us $\frac{-20c}{-2a}=\frac{-2ax}{-2a}$ so $\frac{10c}{a}=x$.