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9d-d+d+8-6d=0
We simplify the equation to the form, which is simple to understand
9d-d+d+8-6d=0
We move all terms containing d to the left and all other terms to the right.
+9d-1d+1d-6d=0-8
We simplify left and right side of the equation.
+3d=-8
We divide both sides of the equation by 3 to get d.
d=-2.66666666667
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