1. The problem is to fill in the blanks related to literal equations and their components. 2. Literal equations involve more than one letter or variable, such as $-ax + 6 = -21$. 3. We often need to solve a literal equation for a specific variable. To \textbf{isolate} that variable on one side of the equal sign, we can use the same properties of \textbf{equality} we use to solve equations with one variable. 4. Equations often have additional letters (besides $x$ or $y$) that stand for unknown coefficients or \textbf{constants}. For example, the equation $-ax + 6 = -21$ uses the letter $a$ as the \textbf{coefficient} of $x$. 5. Sometimes we’ll want to solve for an unknown value like \textbf{$x$}. 6. Other times, we might solve for \textbf{$x$} but keep the letter $a$ in the final equation to indicate the unknown value. Final answers for blanks: - To \textbf{isolate} that variable - Properties of \textbf{equality} - Unknown coefficients or \textbf{constants} - Letter $a$ as the \textbf{coefficient} - Solve for \textbf{$x$} - Solve for \textbf{$x$} but keep $a$ in the equation