1. **State the problem:** Solve the equation $3r - 4 = 8$ for $r$. 2. **Write down the equation:** $$3r - 4 = 8$$ 3. **Add 4 to both sides** to isolate the term with $r$: $$3r - 4 + 4 = 8 + 4$$ $$3r = 12$$ 4. **Divide both sides by 3** to solve for $r$: $$\frac{\cancel{3}r}{\cancel{3}} = \frac{12}{3}$$ $$r = 4$$ 5. **Final answer:** $r = 4$. This means the value of $r$ that satisfies the equation is 4.