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-7d=-1-7d
We move all terms to the left:
-7d-(-1-7d)=0
We add all the numbers together, and all the variables
-7d-(-7d-1)=0
We get rid of parentheses
-7d+7d+1=0
We add all the numbers together, and all the variables
1!=0
There is no solution for this equation
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