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0.09-3.5d=-3.1d+3.89
We move all terms to the left:
0.09-3.5d-(-3.1d+3.89)=0
We get rid of parentheses
-3.5d+3.1d-3.89+0.09=0
We add all the numbers together, and all the variables
-0.4d-3.8=0
We move all terms containing d to the left, all other terms to the right
-0.4d=3.8
d=3.8/-0.4
d=-9+0.2/0.4
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