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4d + 15 - 8d = -1
We simplify the equation to the form, which is simple to understand
4d+15-8d=-1
We move all terms containing d to the left and all other terms to the right.
+4d-8d=-1-15
We simplify left and right side of the equation.
-4d=-16
We divide both sides of the equation by -4 to get d.
d=4
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