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681=21+33d
We move all terms to the left:
681-(21+33d)=0
We add all the numbers together, and all the variables
-(33d+21)+681=0
We get rid of parentheses
-33d-21+681=0
We add all the numbers together, and all the variables
-33d+660=0
We move all terms containing d to the left, all other terms to the right
-33d=-660
d=-660/-33
d=+20
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