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2=-6d+7d+9
We move all terms to the left:
2-(-6d+7d+9)=0
We add all the numbers together, and all the variables
-(d+9)+2=0
We get rid of parentheses
-d-9+2=0
We add all the numbers together, and all the variables
-1d-7=0
We move all terms containing d to the left, all other terms to the right
-d=7
d=7/-1
d=-7
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