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24=45-d
We move all terms to the left:
24-(45-d)=0
We add all the numbers together, and all the variables
-(-1d+45)+24=0
We get rid of parentheses
1d-45+24=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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