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16.2+15.4+28.7-d=82
We move all terms to the left:
16.2+15.4+28.7-d-(82)=0
We add all the numbers together, and all the variables
-1d-21.7=0
We move all terms containing d to the left, all other terms to the right
-d=21.7
d=21.7/-1
d=-21+0.7/1
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