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-23=d/3-30
We move all terms to the left:
-23-(d/3-30)=0
We get rid of parentheses
-d/3+30-23=0
We multiply all the terms by the denominator
-d+30*3-23*3=0
We add all the numbers together, and all the variables
-1d+21=0
We move all terms containing d to the left, all other terms to the right
-d=-21
d=-21/-1
d=+21
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