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4d=5d-9
We move all terms to the left:
4d-(5d-9)=0
We get rid of parentheses
4d-5d+9=0
We add all the numbers together, and all the variables
-1d+9=0
We move all terms containing d to the left, all other terms to the right
-d=-9
d=-9/-1
d=+9
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