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9+10d=2+9d
We move all terms to the left:
9+10d-(2+9d)=0
We add all the numbers together, and all the variables
10d-(9d+2)+9=0
We get rid of parentheses
10d-9d-2+9=0
We add all the numbers together, and all the variables
d+7=0
We move all terms containing d to the left, all other terms to the right
d=-7
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