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-(d-1)+18=-1
We move all terms to the left:
-(d-1)+18-(-1)=0
We add all the numbers together, and all the variables
-(d-1)+19=0
We get rid of parentheses
-d+1+19=0
We add all the numbers together, and all the variables
-1d+20=0
We move all terms containing d to the left, all other terms to the right
-d=-20
d=-20/-1
d=+20
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