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9+9d=3+10d
We move all terms to the left:
9+9d-(3+10d)=0
We add all the numbers together, and all the variables
9d-(10d+3)+9=0
We get rid of parentheses
9d-10d-3+9=0
We add all the numbers together, and all the variables
-1d+6=0
We move all terms containing d to the left, all other terms to the right
-d=-6
d=-6/-1
d=+6
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