WILL MARK BRAINLIEST

Answer:
d = [tex]\frac{1}{4}[/tex]
Step-by-step explanation:
Given
= 16(d + 1) = - 20 ← distribute parenthesis on left side
- 16d - 16 = - 20 ( add 16 to both sides )
- 16d = - 4 ( divide both sides by - 16 )
d = [tex]\frac{-4}{-16}[/tex] = [tex]\frac{1}{4}[/tex]