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10d+6=3d+55
We move all terms to the left:
10d+6-(3d+55)=0
We get rid of parentheses
10d-3d-55+6=0
We add all the numbers together, and all the variables
7d-49=0
We move all terms containing d to the left, all other terms to the right
7d=49
d=49/7
d=7
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