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2-7d=-79
We simplify the equation to the form, which is simple to understand
2-7d=-79
We move all terms containing d to the left and all other terms to the right.
-7d=-79-2
We simplify left and right side of the equation.
-7d=-81
We divide both sides of the equation by -7 to get d.
d=11.5714285714
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