1. The problem is to find the value of $$-0.2 - 1.3$$. 2. Subtraction of a number is equivalent to adding its opposite. So, $$a - b = a + (-b)$$. 3. Applying this rule, $$-0.2 - 1.3 = -0.2 + (-1.3)$$. 4. Now, add the two negative numbers: $$-0.2 + (-1.3) = -(0.2 + 1.3) = -1.5$$. 5. Therefore, $$-0.2 - 1.3 = -1.5$$. 6. Among the options, the equivalent addition problem is $$-0.2 + (-1.3)$$.