Add: (4d-3)+(12d+4

To simplify the expression, you will first need to combine like terms.

The expression is (4d - 3) + (12d + 4).

First, distribute the addition sign to each term inside the parentheses:

4d + (-3) + 12d + 4.

Then, combine the like terms:

(4d + 12d) + (-3 + 4) = 16d + 1.

Therefore, the simplified expression is 16d + 1.