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4d-2d-3d-7--3d=0
We simplify the equation to the form, which is simple to understand
4d-2d-3d-7+3d=0
We move all terms containing d to the left and all other terms to the right.
+4d-2d-3d+3d=0+7
We simplify left and right side of the equation.
+2d=+7
We divide both sides of the equation by 2 to get d.
d=3.5
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