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17.7=d+8.2
We move all terms to the left:
17.7-(d+8.2)=0
We get rid of parentheses
-d-8.2+17.7=0
We add all the numbers together, and all the variables
-1d+9.5=0
We move all terms containing d to the left, all other terms to the right
-d=-9.5
d=-9.5/-1
d=9+0.5/1
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