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6=2d-12
We move all terms to the left:
6-(2d-12)=0
We get rid of parentheses
-2d+12+6=0
We add all the numbers together, and all the variables
-2d+18=0
We move all terms containing d to the left, all other terms to the right
-2d=-18
d=-18/-2
d=+9
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