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]

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