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17d-16d+d+d=-18
We simplify the equation to the form, which is simple to understand
17d-16d+d+d=-18
We move all terms containing d to the left and all other terms to the right.
+17d-16d+1d+1d=-18
We simplify left and right side of the equation.
+3d=-18
We divide both sides of the equation by 3 to get d.
d=-6
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