1. The problem asks to "do the same for all of them," but since no specific problems are provided, I will demonstrate solving a typical algebraic equation as an example. 2. Consider the equation $2x + 3 = 7$. We want to solve for $x$. 3. The formula used here is to isolate $x$ by performing inverse operations. 4. First, subtract 3 from both sides: $$2x + 3 - 3 = 7 - 3$$ which simplifies to $$2x = 4$$ 5. Next, divide both sides by 2 to solve for $x$: $$\frac{\cancel{2}x}{\cancel{2}} = \frac{4}{2}$$ which simplifies to $$x = 2$$ 6. Therefore, the solution to the equation $2x + 3 = 7$ is $x = 2$. This method can be applied similarly to other linear equations to isolate the variable and find its value.