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2.3+2d=12
We move all terms to the left:
2.3+2d-(12)=0
We add all the numbers together, and all the variables
2d-9.7=0
We move all terms containing d to the left, all other terms to the right
2d=9.7
d=9.7/2
d=4+1/1.1764705882353
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