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7d+12-14d-3=0
We simplify the equation to the form, which is simple to understand
7d+12-14d-3=0
We move all terms containing d to the left and all other terms to the right.
+7d-14d=0-12+3
We simplify left and right side of the equation.
-7d=-9
We divide both sides of the equation by -7 to get d.
d=1.28571428571
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