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-d/9.7=-20.8
We move all terms to the left:
-d/9.7-(-20.8)=0
We add all the numbers together, and all the variables
-d/9.7+20.8=0
We multiply all the terms by the denominator
-d+(20.8)*9.7=0
We add all the numbers together, and all the variables
-1d+201.76=0
We move all terms containing d to the left, all other terms to the right
-d=-201.76
d=-201.76/-1
d=201+0.75999999999999/1
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