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-28=21+d
We move all terms to the left:
-28-(21+d)=0
We add all the numbers together, and all the variables
-(d+21)-28=0
We get rid of parentheses
-d-21-28=0
We add all the numbers together, and all the variables
-1d-49=0
We move all terms containing d to the left, all other terms to the right
-d=49
d=49/-1
d=-49
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