16d - (4 - 5d) = -67 Please help me find d

The negative at the other side of the parenthesis must be distributed inside the parenthesis changing the equation to 16d -4 + 5d = -67.

now add any like terms. in this equation that would be 16d + 5d = 21d 

now the equation vhanges too 21d - 4 = -67 

now you isolate the variable. so add 4 to both sides of the equal sign 
21d - 4 (+4) = -67 (+4) 

21d =  - 63

divide by 21 on both side of equal sign 21d(/21) = -63 (/21) 

d= -3

Understanding what? lol