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20-9d=-20-6d-17
We move all terms to the left:
20-9d-(-20-6d-17)=0
We add all the numbers together, and all the variables
-9d-(-6d-37)+20=0
We get rid of parentheses
-9d+6d+37+20=0
We add all the numbers together, and all the variables
-3d+57=0
We move all terms containing d to the left, all other terms to the right
-3d=-57
d=-57/-3
d=+19
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