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-6.3=d-3.4
We move all terms to the left:
-6.3-(d-3.4)=0
We get rid of parentheses
-d+3.4-6.3=0
We add all the numbers together, and all the variables
-1d-2.9=0
We move all terms containing d to the left, all other terms to the right
-d=2.9
d=2.9/-1
d=-2+0.9/1
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