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-4d-47=7+8
We simplify the equation to the form, which is simple to understand
-4d-47=7+8
We move all terms containing d to the left and all other terms to the right.
-4d=+7+8+47
We simplify left and right side of the equation.
-4d=+62
We divide both sides of the equation by -4 to get d.
d=-15.5
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