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12d-6+4d=0
We simplify the equation to the form, which is simple to understand
12d-6+4d=0
We move all terms containing d to the left and all other terms to the right.
+12d+4d=0+6
We simplify left and right side of the equation.
+16d=+6
We divide both sides of the equation by 16 to get d.
d=0.375
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