how do you solve 4-d=-(d-4)

Question

please tell me how to solve this problem . i really need a better understanding on this problem. 4-d=-(d-4)

Answer 1

4 - d = -(d - 4)
4 - d = -d + 4
4 - d = 4 - d
0 = 0

Hence, the solution is all real numbers.
To understand this, substitute any real value of d in and you will see that it fits.