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-2.9=d+6.2
We move all terms to the left:
-2.9-(d+6.2)=0
We get rid of parentheses
-d-6.2-2.9=0
We add all the numbers together, and all the variables
-1d-9.1=0
We move all terms containing d to the left, all other terms to the right
-d=9.1
d=9.1/-1
d=-9+0.1/1
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