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5d=21+4d
We move all terms to the left:
5d-(21+4d)=0
We add all the numbers together, and all the variables
5d-(4d+21)=0
We get rid of parentheses
5d-4d-21=0
We add all the numbers together, and all the variables
d-21=0
We move all terms containing d to the left, all other terms to the right
d=21
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