1. **Problem statement:** Find the result of the first problem: $-1.3 + 1.3$. 2. **Formula and rules:** Addition of real numbers follows the rule that adding a number and its opposite results in zero: $a + (-a) = 0$. 3. **Intermediate work:** $$-1.3 + 1.3 = 0$$ 4. **Explanation:** Adding $-1.3$ and $1.3$ cancels out because they are opposites, so the sum is zero. **Final answer:** $0$