\( \begin{array}{ll}\text { 17. }-8 y=120 & \text { 18. }-12=\frac{y}{-6} \\ \text { 21. }-8=\frac{y}{11} & \text { 22. }-52=-13 m \\ \text { 25. }-39=-3 n & \text { 26. } 5=\frac{m}{8} \\ \text { 29. } 81=9 b & \text { 30. } \frac{x}{25}=-8\end{array} \)

To solve these equations, it's important to remember that each equation represents a unique relationship. For example, in \(-8y = 120\), the easy first step is to divide both sides by -8, revealing that \(y = -15\). Similarly, in \(-12 = \frac{y}{-6}\), multiplying -6 throughout helps find that \(y = 72\). When solving equations like \(-52 = -13m\), clarity comes from isolating the variable; dividing gives \(m = 4\). Watch out for common errors, such as sign mistakes or losing track of the variable during calculations. Always double-check your work by substituting your solution back into the original equation!