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21=48-d
We move all terms to the left:
21-(48-d)=0
We add all the numbers together, and all the variables
-(-1d+48)+21=0
We get rid of parentheses
1d-48+21=0
We add all the numbers together, and all the variables
d-27=0
We move all terms containing d to the left, all other terms to the right
d=27
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