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21=07d-35
We move all terms to the left:
21-(07d-35)=0
We get rid of parentheses
-07d+35+21=0
We add all the numbers together, and all the variables
-7d+56=0
We move all terms containing d to the left, all other terms to the right
-7d=-56
d=-56/-7
d=+8
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