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47d+100=97d-100
We move all terms to the left:
47d+100-(97d-100)=0
We get rid of parentheses
47d-97d+100+100=0
We add all the numbers together, and all the variables
-50d+200=0
We move all terms containing d to the left, all other terms to the right
-50d=-200
d=-200/-50
d=+4
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