1. The problem asks to solve or simplify parts 3c and 4a from Essential Mathematics Exercise 3.4. 2. Since the exact questions are not provided, I will demonstrate typical algebraic steps for parts labeled 3c and 4a in such exercises, usually involving solving equations or simplifying expressions. 3. For 3c, suppose the problem is to solve an equation like $$2x + 3 = 7$$. 4. Subtract 3 from both sides: $$2x = 7 - 3$$. 5. Simplify the right side: $$2x = 4$$. 6. Divide both sides by 2: $$x = \frac{4}{2} = 2$$. 7. For 4a, suppose the problem is to simplify an expression like $$\frac{3x^2 - 6x}{3x}$$. 8. Factor numerator: $$3x^2 - 6x = 3x(x - 2)$$. 9. Rewrite the expression: $$\frac{3x(x - 2)}{3x}$$. 10. Cancel common factors $$3x$$: $$x - 2$$. 11. Final simplified expression is $$x - 2$$. These steps illustrate typical solutions for parts 3c and 4a in algebra exercises. Final answers: - 3c: $$x = 2$$ - 4a: $$x - 2$$