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9/7d=81
We simplify the equation to the form, which is simple to understand
9/7d=81
We move all terms containing d to the left and all other terms to the right.
+7d=+81
We simplify left and right side of the equation.
+7d=+81
We divide both sides of the equation by 7 to get d.
d=11.571428571429
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