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8-3d-2d=-7
We simplify the equation to the form, which is simple to understand
8-3d-2d=-7
We move all terms containing d to the left and all other terms to the right.
-3d-2d=-7-8
We simplify left and right side of the equation.
-5d=-15
We divide both sides of the equation by -5 to get d.
d=3
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