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12=14-d
We move all terms to the left:
12-(14-d)=0
We add all the numbers together, and all the variables
-(-1d+14)+12=0
We get rid of parentheses
1d-14+12=0
We add all the numbers together, and all the variables
d-2=0
We move all terms containing d to the left, all other terms to the right
d=2
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