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4.78dd=0
We simplify the equation to the form, which is simple to understand
4.78dd=0
We move all terms containing d to the left and all other terms to the right.
+4.78dd=0
We simplify left and right side of the equation.
+4.78d=0
We divide both sides of the equation by 4.78 to get d.
d=0
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