3) \( 7 x+18 x=9 \)

Did you know that combining like terms is one of the first things you learn in algebra? In your equation, \( 7x + 18x = 9 \), you can add \( 7x \) and \( 18x \) to get \( 25x = 9 \). It's like collecting your treasure—bringing similar items together makes it easier to see the total! Now, you’ve simplified the equation, but what's next? To isolate \( x \), simply divide both sides by 25. You’ll find that \( x = \frac{9}{25} \). It's like a treasure map leading you to the answer! Always remember to double-check your work to catch any pesky mistakes in your calculations. Happy solving!