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3(2d+7)=39*
We move all terms to the left:
3(2d+7)-(39*)=0
We add all the numbers together, and all the variables
3(2d+7)-0=0
We add all the numbers together, and all the variables
3(2d+7)=0
We multiply parentheses
6d+21=0
We move all terms containing d to the left, all other terms to the right
6d=-21
d=-21/6
d=-3+1/2
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