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-2.5+5.5d=42
We move all terms to the left:
-2.5+5.5d-(42)=0
We add all the numbers together, and all the variables
5.5d-44.5=0
We move all terms containing d to the left, all other terms to the right
5.5d=44.5
d=44.5/5.5
d=8+0.5/5.5
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