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4d+3-7d=39+4d+9
We simplify the equation to the form, which is simple to understand
4d+3-7d=39+4d+9
We move all terms containing d to the left and all other terms to the right.
+4d-7d-4d=+39+9-3
We simplify left and right side of the equation.
-7d=+45
We divide both sides of the equation by -7 to get d.
d=-6.42857142857
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