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-8-d-19d=-20d-8
We move all terms to the left:
-8-d-19d-(-20d-8)=0
We add all the numbers together, and all the variables
-20d-(-20d-8)-8=0
We get rid of parentheses
-20d+20d+8-8=0
We add all the numbers together, and all the variables
=0
d=0/1
d=0
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