1. The problem is not explicitly stated, so I will assume you want a detailed example of solving a linear equation. 2. Let's solve the equation $3x + 5 = 20$. 3. The formula used here is to isolate the variable $x$ by performing inverse operations. 4. First, subtract 5 from both sides: $$3x + 5 - 5 = 20 - 5$$ which simplifies to $$3x = 15$$ 5. Next, divide both sides by 3 to solve for $x$: $$\frac{3x}{\cancel{3}} = \frac{15}{\cancel{3}}$$ which simplifies to $$x = 5$$ 6. Therefore, the solution to the equation $3x + 5 = 20$ is $x = 5$. This method can be applied to similar linear equations by performing inverse operations step-by-step to isolate the variable.