4. What is the solution to the equation
   ?
   

To solve the equation , we first distribute the left side:

Next, we can isolate by bringing all terms involving to one side of the equation and the constants to the other side:

This simplifies to:

Now we can divide both sides by -0.8:

So, the solution is , which corresponds to option (B).

Here’s a fun fact: solving algebraic equations like this one is essential in various fields, from engineering to economics, helping professionals optimize systems and financial models!

When working with equations, a common mistake can be misapplying the distributive property or dropping negative signs. Always double-check your work to ensure you haven’t accidentally altered the signs of any terms during the solution process!