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5d-3d-12d+d=0
We simplify the equation to the form, which is simple to understand
5d-3d-12d+d=0
We move all terms containing d to the left and all other terms to the right.
+5d-3d-12d+1d=0
We simplify left and right side of the equation.
-9d=0
We divide both sides of the equation by -9 to get d.
d=-0
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