1. **State the problem:** Solve the equation $19l - 57 = 19$ for $l$. 2. **Add 57 to both sides** to isolate the term with $l$: $$19l - 57 + 57 = 19 + 57$$ which simplifies to $$19l = 76$$ 3. **Divide both sides by 19** to solve for $l$: $$\frac{19l}{\cancel{19}} = \frac{76}{\cancel{19}}$$ which simplifies to $$l = 4$$ 4. **Final answer:** $l = 4$