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47=2d+15
We move all terms to the left:
47-(2d+15)=0
We get rid of parentheses
-2d-15+47=0
We add all the numbers together, and all the variables
-2d+32=0
We move all terms containing d to the left, all other terms to the right
-2d=-32
d=-32/-2
d=+16
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