1. Let's restate the problem: We need to solve part 4 of the problem similarly to the previous parts, but without using the number line. 2. The general approach to solving inequalities or equations involves isolating the variable and simplifying expressions step-by-step. 3. Since the exact problem statement for part 4 is not provided, let's assume it follows the pattern of previous parts, which likely involve solving an inequality or equation. 4. For example, if part 4 is solving an inequality like $$ax + b > c$$, we use the rule: to isolate $x$, subtract $b$ from both sides and then divide by $a$, remembering to reverse the inequality sign if $a$ is negative. 5. Step-by-step: - Start with $$ax + b > c$$ - Subtract $b$ from both sides: $$ax > c - b$$ - Divide both sides by $a$: $$x > \frac{c - b}{a}$$ if $a > 0$, or $$x < \frac{c - b}{a}$$ if $a < 0$. 6. This method avoids using the number line and relies purely on algebraic manipulation. 7. If you provide the exact expression for part 4, I can solve it explicitly using these steps. Final answer depends on the specific problem, but the method above applies generally.