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-2+6d=7+9d
We move all terms to the left:
-2+6d-(7+9d)=0
We add all the numbers together, and all the variables
6d-(9d+7)-2=0
We get rid of parentheses
6d-9d-7-2=0
We add all the numbers together, and all the variables
-3d-9=0
We move all terms containing d to the left, all other terms to the right
-3d=9
d=9/-3
d=-3
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