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