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31=-6d+9d-2
We move all terms to the left:
31-(-6d+9d-2)=0
We add all the numbers together, and all the variables
-(3d-2)+31=0
We get rid of parentheses
-3d+2+31=0
We add all the numbers together, and all the variables
-3d+33=0
We move all terms containing d to the left, all other terms to the right
-3d=-33
d=-33/-3
d=+11
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