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51=6d+9
We move all terms to the left:
51-(6d+9)=0
We get rid of parentheses
-6d-9+51=0
We add all the numbers together, and all the variables
-6d+42=0
We move all terms containing d to the left, all other terms to the right
-6d=-42
d=-42/-6
d=+7
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