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-2+8d=-2+9d
We move all terms to the left:
-2+8d-(-2+9d)=0
We add all the numbers together, and all the variables
8d-(9d-2)-2=0
We get rid of parentheses
8d-9d+2-2=0
We add all the numbers together, and all the variables
-d=0
d=0/-1
d=0
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