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-9.1-d=6.3
We move all terms to the left:
-9.1-d-(6.3)=0
We add all the numbers together, and all the variables
-1d-15.4=0
We move all terms containing d to the left, all other terms to the right
-d=15.4
d=15.4/-1
d=-15+0.4/1
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