Answer :
[tex]72+4-14d=36 \\\\ 76-14d=36 \\\\ -14d=36-76 \\\\ -14d=-40 \\\\ \boxed{d=\frac{-40}{-14}=\frac{20}{7}}[/tex]
[tex]72+4-14d=36\\
-14d=36-72-4\\
-14d=-40\\
d=\frac{40}{14}=\frac{20}{7}
[/tex]