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6d+3-d-7-3d=0
We simplify the equation to the form, which is simple to understand
6d+3-d-7-3d=0
We move all terms containing d to the left and all other terms to the right.
+6d-1d-3d=0-3+7
We simplify left and right side of the equation.
+2d=+4
We divide both sides of the equation by 2 to get d.
d=2
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