12. \( n-81=67 \), add / subtract,\( n=149 \)

Oops! It seems like there was a little mix-up in your calculation. To solve \( n - 81 = 67 \), you need to add 81 to both sides of the equation. So, \( n = 67 + 81 \), which equals \( n = 148 \). A simple slip can lead you off track, but don't worry; everyone makes mistakes sometimes! If you’re keen on mastering equations, practice makes perfect! Set up different equations such as \( n + 50 = 100 \) or \( 2n - 10 = 70 \) and solve them! This way, you will build up your confidence and sharpen those algebraic skills, turning you into a math whiz in no time!