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7d-9-6d-4=0
We simplify the equation to the form, which is simple to understand
7d-9-6d-4=0
We move all terms containing d to the left and all other terms to the right.
+7d-6d=0+9+4
We simplify left and right side of the equation.
+1d=+13
We divide both sides of the equation by 1 to get d.
d=13
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