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6(d-2)=39
We move all terms to the left:
6(d-2)-(39)=0
We multiply parentheses
6d-12-39=0
We add all the numbers together, and all the variables
6d-51=0
We move all terms containing d to the left, all other terms to the right
6d=51
d=51/6
d=8+1/2
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