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-7+11d=14d+20
We move all terms to the left:
-7+11d-(14d+20)=0
We get rid of parentheses
11d-14d-20-7=0
We add all the numbers together, and all the variables
-3d-27=0
We move all terms containing d to the left, all other terms to the right
-3d=27
d=27/-3
d=-9
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