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-4d-12=6-d
We move all terms to the left:
-4d-12-(6-d)=0
We add all the numbers together, and all the variables
-4d-(-1d+6)-12=0
We get rid of parentheses
-4d+1d-6-12=0
We add all the numbers together, and all the variables
-3d-18=0
We move all terms containing d to the left, all other terms to the right
-3d=18
d=18/-3
d=-6
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